Malicious PDF — malware analysis report

Static analysis result for SHA-256 3885a16514cc2e59…

MALICIOUS

PDF

85.5 KB Created: 2021-09-13 21:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53a1ab97c391f789d2a9e5193fb4156d SHA-1: 3ae9140a240d8b9c4747f517e8ba6480f48f69f7 SHA-256: 3885a16514cc2e593358c322b2cdf67320770ceae51d7f5f5e17eef53079ee3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://syntrend.critical.tw/upload/files/luxosonemi.pdf In PDF document text
    • https://noventa.cz/media/files/file/sivelipunu.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/75298475882.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/30452231581.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/69819188062.pdfIn PDF document text
    • http://4bx.pl/public/file/davanalapuzafikulebur.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/fd85c75eb7bbdf1a4b633d4154ecefaf/nupaxoxirokizagexalolafaj.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2b8314a8e---11581219787.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/vejutonawunulawobudemem.pdfIn PDF document text
    • http://chamdure.com/DATA/files/falumotosawusonajonazema.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/dufuw.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/fegexitaj.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/wibafilugilafazukejix.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/diriguwiwowabuwisorodu.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/lejabilojinedoromi.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/ribologavikuwut.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/14008440620.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fd04efb79---66322570103.pdfIn PDF document text
    • http://sooclose.eu/upload/File/17745257519.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/99677508728.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/nazemufewozodutu.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/gevosubumaradat.pdfIn PDF document text
    • https://jss-moms.si/upload/File/33584932816.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/57954348899.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/wodumub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=billie+eilish+documentary+free+onlinePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D2 18400 bytes
SHA-256: 44dfc27547b676c5b4fe78bdc9525c074f407c5e00d2562778b43ccc4c8eab2c
font_01_sfnt_off0001167f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E96 11008 bytes
SHA-256: 05a5272165d7d98c5ab70391e978641c6f51d2930f0bdd38aa48ae361ebdd2b1

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