Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ec926828148da8…

MALICIOUS

PDF

88.3 KB Created: 2021-07-01 19:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 819def5507909f612fc4194dc60084cc SHA-1: b92468410d980c3aa34e51b45e39993e91161beb SHA-256: 41ec926828148da8e81243fad7ccad68b2de178070f4f9029242597d23e5d1d1
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/qr1ueqhcg0q7b4921tgbekh83q/sevosiwojawekupujebulav.pdf In PDF document text
    • https://juhaszautovill.hu/userfiles/file/30808947034.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ccf97741e---92905659188.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/lugtuioupah9s6h853qpdh1llc/resebawezaxoxovudoxoxamug.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/4e2aecac45c049ce7bbea9ede5bf3a9b/jejilagijizez.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/40763284b23a3ea5909e5e3b57e165a0/najod.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/60567184227.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a249268a864---29743335297.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/296079bb03c20098c5502730f9793e2d/nuzekawaladofokaradat.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/vl034sc77imd8p0um42paq9kfh/nowogujazafuwitisokotojo.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/79179175398.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/zevuzulinatafope.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/230148108898.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c15515337a6---metogema.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/1778622418.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/s58juqqsiq54oohvqlqcs961ls/17091272626.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/medapenazugekes.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f42a49a18---99363534289.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/kegewategi.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/zemetinalize.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/i56s05v9n527du6nqvgcltiiuh/didum.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/54569036908.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/e2703257075d2d659f1d247d3ac3748c/29917372525.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bfd9456ea---20150469048.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608caacad1386---32459069520.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/lufupeman.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=can+you+cook+chicken+on+wax+paperPDF 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_off0000f262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF262 18356 bytes
SHA-256: 3cb85a1f33bf880a5d9ea660f853b4c9ae3ad4736fed50f68521ca08c8ccf669
font_01_sfnt_off00012184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001399b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399B 10684 bytes
SHA-256: 09fe5157cff145e4bd83ef85941c55203df4db6d957f125fa1bb856e345c4ea6

Open this report in the interactive analyzer, or submit your own file for analysis.