Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8ae664f46722aa…

MALICIOUS

PDF

93.2 KB Created: 2021-06-30 10:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c39c420111eb319be56fda46a5c1a79f SHA-1: 36e27cf727f8480ddea011608893306ce7b3ed14 SHA-256: bb8ae664f46722aa7c2048dfeba41271f2723a286a14fee09839354995ec3c32
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised websites, many of which are hosted on disposable domains or use common CMS upload vulnerabilities, indicating a link farm designed to host malicious files. The presence of a 'download button' heuristic further suggests a lure to download a payload. ClamAV detection and ML classification confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7039b94813---voxedosiworax.pdf
    • http://phanphoiongnhuahoasen.vn/upload/files/fipatozugonekutik.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/db163603e0cd70cc35a26de3b350f979/96668620467.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160858cbe94dff---wirozoduxub.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16072fb23a63e7---xirefafapewe.pdf
    • http://weddingceremoniesbybev.com/clients/72651/File/lalalaxilimifewosijinu.pdf
    • https://mimpishio1.com/contents//files/sozizelejidobavalixuj.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0b0c90797---vabuj.pdf
    • https://swift-tw.com/lcc/upload/files/9138727236.pdf
    • http://homelife-superstars.com/image/files/gedenudawaxega.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c745f4edd4---63708674038.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/2b4fae204b97d0490b8fed9a8d1a2284/8211364353.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a552e159597---pexumeku.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/atbbhhg9mugalfnp8pf1l9l115/logemepinan.pdf
    • http://huiking.cn/uploads/file/112253223022.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/da34a573048fb6ebbb4db0e8f143c7c7/jerufosiwizorexukike.pdf
    • http://phuocthuan.vn/images/pic/file/37504198142.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/2524f8a534d4586f619a1e0b83d98807/zupomixakinizejosaje.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/615deca95cb8d3ce50f45932521140b5/65905894724.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811d09c02b7---guduzatotojipadumagomarol.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd254d2cd7---sugizoguvezategiterobe.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af252ca38a6---85722835148.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5f830267a61a1d5cc51d950026ef8e8a/xavagemosoti.pdf
    • https://fertilizergranulatorprice.com/d/files/22559280393.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a05da01c543---kerasonajovovowawolumod.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/06lujqvv569vu7ij4qp9j54nf6/2392880159.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=plus+one+english+model+question+paper+2020
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf7.bin
db085d5a21d46d18320193eae1acef76029a2ca165f457d39fd671a272b3e92d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 11328 bytes
font_01_sfnt_off000107e9.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x107E9 16092 bytes
font_02_sfnt_off00011d2a.bin
76d6f31c8bd6253b2065c54ab2120748708ca0b2ff49ef6512268dcfe58dfca8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2A 17820 bytes
font_03_sfnt_off00014b9e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B9E 16792 bytes