Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0c958d8285ff60…

MALICIOUS

PDF

106.2 KB Created: 2021-09-07 13:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6e025d2906011c10339aecc0183f408c SHA-1: 541e64104d259be58cb99aa61ffd496b819edb6e SHA-256: ac0c958d8285ff60410d3ee5684ff95ca6daad0b27fbb52a4b6e1ececfd1250a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The document's structure and embedded URLs suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://timeyear-v.com/userfiles/file/sajeluwugawusuleme.pdf In PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607826edce33d---26521364926.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/gupuromeveguduvagoduzuvum.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085205693469---wozumovulij.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/fuwugizesowako.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/49785106851.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/33188320969.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/52358185172.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/af2f26c766007f608bc884054ee310bb/rororarunale.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77b65aa165---xodomixivupoju.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/vetefowafejiveve.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3bc132d2c6141582117bbde2aabf41f3/luzutamesevego.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/kemuropovexurip.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/pupimorodegazazikate.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202108221244212561.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/67043797549.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/33941886475.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/linusadojibobalusekitunaj.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613033e64d089---33765337316.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/3609251396.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/rujawoxana.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/p5psb9cgocne59l6eica0hiu1a/94655638831.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160927ecde01cd---disejodogepuginogexuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=smart+bracelet+sustained+heart+rate+manualPDF 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_off00013a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15241 18416 bytes
SHA-256: 00e161010dc73522fe6a23b3ac926c53df38b06ba85f4b652f5d298d788c9c24
font_02_sfnt_off000181d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181D0 10828 bytes
SHA-256: 83506f4fc456fb03a917ceec0e4d843691e77b8a7fb15ea067c987ec008ed2a0

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