Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc3ae28908ef56f…

MALICIOUS

PDF

99.2 KB Created: 2021-07-16 14:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d67bd48027b6ae80c48c91bfedd608f2 SHA-1: f9e01801175f7c344fdbede22bd4fb7ab775f891 SHA-256: 5bc3ae28908ef56f44301a81f3c24fb47b93415f6f78e78def4a70617ed9d052
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing form plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and appears to be non-readable content, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • 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.
  • 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://abril.pe/wp-content/plugins/super-forms/uploads/php/files/qid2p8f48m52el9up10nolp029/40776794579.pdf In PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/vafusuforageru.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bdbf31210---gaxawitebegu.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d7192f080---33271344219.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/ldv4c15bjfvdsjbb8jv7ds3ngn/nofozepuzaki.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/1d9a6de7bc5f80c33f648403bc0fc0de/28156361402.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/64dcc38c073fb32cbd3ac875bb6c4ae9/53524316089.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/tudopasude.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc001b2e101---tovexilozoxu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160de0e07ce273---fusizupifafififu.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/65370065441.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792bf185bdd---61399844284.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/rijoxejobosinazaxutata.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/36072741898.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fca978182---wuwuxeveguvekobubo.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607182da42b1b---39682743401.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210518011937.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/2d077ee3b76c23ca77b0e380d763ec53/85736821046.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202106/1623855164.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7bda0a67---figaliregur.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/pabatuvowezis.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/c3721mvs5dam9n50ipos4ghdj1/keseleralezeromawelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cute+things+to+do+to+your+boyfriend+while+cuddlingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10653 17104 bytes
SHA-256: 22eb63a6fc04a920d519486ba59339dbf32de9ac329daf63dd22291efd5053a3
font_01_sfnt_off000132e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E5 17240 bytes
SHA-256: c789681bbdfb22487748e5cc5e9eb876c701ba78d15bab5a56aadc64358618a0
font_02_sfnt_off00014ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000164e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164E3 11064 bytes
SHA-256: c0397790dcaa77f6dd66fd6871c2cc09db6596347e1fbfdfbb498dcd93e1ea5f

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