Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bb6b8b48d8e3cc…

MALICIOUS

PDF

92.3 KB Created: 2021-06-29 09:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76ab8cdf75547deddfc04c4bcc9cc4a4 SHA-1: ad5f6b238991553b19363fc856ce0462a51a0160 SHA-256: a3bb6b8b48d8e3ccc0fe91a824af8606d29bb244693c1cfed537f5ab90a9dde7
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The embedded URLs suggest the document's primary purpose is to redirect users to external, untrusted sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://grafichesirio.com/userfiles/files/nuberojofebabobegiju.pdf
    • http://mtsskzy.com/userfiles/file/79960001612.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-20/20210520130941112597.pdf
    • http://kath-kiga-bw.de/bilder/berichte/file/goxevinilufugojupu.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/66507212878.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/2f07n9v54vhq2l513mjlq5hlfq/86992273957.pdf
    • http://niengrangchuyensau.com/upload/contentFile/file/tawedurodofozumujabus.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1edef145af---35477387573.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e8eb767e1fe151f58be4e5ccbb3193bc/77872924634.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/955097b49b82a2e9bd5fad94f7a8a230/foletererilonuve.pdf
    • http://tktravel.shop/FileData/ckfinder/files/20210610_2EBC5103A040F14C.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/86360c4a09c12f0f50f91625ef64ca71/noxerumimigajuwok.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/55976ac5354fc35ecaf8da03b203284a/sefogobufopuvamomalizen.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c710a00c169---24792448802.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0df30a8a81---pakagivetosogolabisis.pdf
    • http://springbook.no/files/rowokezitiresavonekeko.pdf
    • http://heureka-cz.eu/files/61572014630.pdf
    • http://amsasecretariat.fr/userfiles/file/pemifewobefugelaw.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6290c3c4c10e8efe09fc2cb99e80dab8/1265037781.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3914d4f50a30306140610f1b5aa03be0/somagulafegivonaxaxuma.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/2k30mg2gtk3gpa3kcac9i29n0c/55177383171.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160832e00d0ca4---pixesukedimakapepaxajeb.pdf
    • http://biswasi.com/userfiles/files/tujuzoralutejalixazojegem.pdf
    • http://anhopphat.com/uploads/files/mumizotimoluzuriz.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b429b309660---54456220471.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=fried+eggplant+without+breadcrumbs
    • 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_off0000ec0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 16792 bytes
font_01_sfnt_off0001041f.bin
1c3597d8bff338a2f4b290a3bc496735040be1e8cc98eb8e76013d5bdba769f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1041F 17812 bytes
font_02_sfnt_off00013288.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13288 16092 bytes
font_03_sfnt_off000147ce.bin
b7a89e4b3b065d80dd75cb50219868913cdd77b76a8bcdd3634f4322c5850362
pdf-font-stream PDF embedded font (sfnt) at offset 0x147CE 11264 bytes