Malicious PDF — malware analysis report

Static analysis result for SHA-256 7740ec144f4bdb85…

MALICIOUS

PDF

84.1 KB Created: 2021-06-17 05:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 13e7c3d5370b61a77a889ec35fd490d8 SHA-1: 3c122eb6aa29341085bf30d0d6d5bede11e9310f SHA-256: 7740ec144f4bdb85d2359e374a3814b5e0450d572fcdee53c9dc758e09d6540c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains, likely intended to lead users to malicious content or phishing pages. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but no direct instructions or lures are discernible from the readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/uplcv?utm_term=special+segments+in+triangles+worksheet PDF link annotation
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa9f07a950---pajizuzijizikugarerusugur.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/42b4b7c0b441de298538d8af2135ad68/35447841896.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/194b894b6286decc9af98e6c66e069f7/fegudewasadeteze.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/c53bb8b0f21abaf041f6f9f5cecde73f/34433494276.pdfIn PDF document text
    • https://menu2uplus.com/images/file/sejidilotorojapufiz.pdfIn PDF document text
    • https://chptravel.ir/data/file/67616252268.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/02f95ca4c5b2a0c26c3d1dd1dbc91f67/50110246446.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeabc4076f3---49419900212.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/sefedakomovamaxe.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc9de2c742---79120753427.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/e783f27b64999058d4c382913618a492/40787027950.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/121201652d62a085f344fc2db35b3cd4/sefonej.pdfIn PDF document text
    • http://strandedtattoo.net/file/37140957907.pdfIn PDF document text
    • https://bamor.org/userfiles/file/jofotakapabawuvuromaj.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/42544750096.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5fa7775962d793e20d3177df131e4a1f/54213619718.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609144c6575e0---28737097493.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/renawupag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 5604 bytes
SHA-256: 435142d08ebc633fcf03893f86f5d88d632d2c0c267ce6bf0ddd826c0595a4ee
font_01_sfnt_off000108a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 10876 bytes
SHA-256: 38845fda2ff2468e282a6e009e9a48be79c8cc18d708e0c801c8f2c38d5b96c9
font_02_sfnt_off00012e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E00 16100 bytes
SHA-256: 0dd7d0c48dbe061f2ccc5e08a50837d895141c045517d8888a36ebd168e088c7

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