Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae2b32530de381d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 23:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a58bce69e25ade59338a6ccb6d567cda SHA-1: 140d029b4c43a2607a30a55219ac0f36f6f363b8 SHA-256: 6ae2b32530de381d822191d79d78de63a1d97b5c8f142193a9a0f39cdce5010e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of 'utm_term=fake+android+location' in one URL suggests a potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/nalarufokuxadenug.pdf In PDF document text
    • http://ibrahimalsada.com/pics/file/mudejulijomisad.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/54929750905.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/79862334989.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/mavuzibagupumimosetupeg.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/pufudediwubev.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/96152112909.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/nijevokejunupomidek.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613838c289305---12364660638.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/dixinemasezisuxerugewu.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/fubalubegufimu.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/zogufarowivivarikajojax.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/10921399712.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/493b3e46397b71eb733d3760831e4684/19551816607.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/64127106623.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/bosufesagofut.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/40816026536.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/vezut.pdfIn PDF document text
    • http://telecycling.info/files/file/19416694219.pdfIn PDF document text
    • http://chinalabware.ru/d/files/vuleg.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/279370313.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/54067755846.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/63177288011.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/43663182874.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/tokonuvuderijagurumujiw.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/ca3a6ea0237c96efc154c341b0db02a1/45392927987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fake+android+locationPDF 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_off0000de0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF620 17852 bytes
SHA-256: e1ab4539ad7713deb541d0c35b15e65d2f8a7f7d03d155545d57895d79e2aaf5
font_02_sfnt_off000124dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DD 10264 bytes
SHA-256: c0a23f4251f391ed483305b8c7354233d620718142ce47799c432f8c0f9c1e2e