Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48f8c2d6dc9d9b8…

MALICIOUS

PDF

90.6 KB Created: 2021-07-01 00:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ada4609496e710bfb79e1bcd4ee6c01d SHA-1: c44d7c54e2b7d5fb579cc5a1986b05bb820b53a8 SHA-256: d48f8c2d6dc9d9b8b4cfd5fc0905964e4691ebdb2008b3d6c70ce77fe55828fa
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to external content, with some hosted on compromised WordPress upload directories. The presence of a 'download button' lure further suggests an attempt to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • 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://activepymes.com/pub/file/65504132900.pdf
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/11373733272.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7740a33b8---gugazewugasejufir.pdf
    • https://arte-salon.ru/upload_picture/42264494076.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/3650ffde832161d5dba061545cec5c31/gukat.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27c27baa9f---xegalobu.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56c208edd---12519555529.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/kdn9uapsqjtp49pel4r2rvbq13/63956464681.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/pk59d9o7vdkm1klm788kg9kqtl/9860238675.pdf
    • http://billedbutikken.dk/articlefiles/file/wikep.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2319f3bb430775641f6b89f76d32295b/farumimugazamufepaz.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/vvchjvtf0ta5san56u8l7b67jn/fulodimudevimepolaw.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160777a390ab16---21399189139.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bff082703d8---vupufu.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/204bebae5e6058868643e2d1a7648bd7/dovujew.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/654f6f631a9b41376cdf87183f84fb7a/xodokavu.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c746886353e---rokimupu.pdf
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/64000062067.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/gf6fejir6nmfj5qknruu15l55f/36955151242.pdf
    • https://tecnicadovolante.com/images/file/zafojuzajebularuxoseligaw.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7515814f4---93201345448.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=class+7+science+chapter+5+extra+questions+and+answers
    • 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_off0000f79f.bin
db86a433eaa3485c15904a19688594f7d270f3e1d920ef9640a2ed805ab2b00c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 16724 bytes
font_01_sfnt_off00012321.bin
aa05cf079b0d51a179545f5e62b3a4c6ff1088f47710f8d6c04d42c0465d7343
pdf-font-stream PDF embedded font (sfnt) at offset 0x12321 1224 bytes
font_02_sfnt_off00012a3f.bin
cb4499439e1da7c12320f4db4aa23027eac3376ea8560b231e4d7439c2aeb945
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3F 11260 bytes
font_03_sfnt_off0001448f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1448F 16792 bytes