Malicious PDF — malware analysis report

Static analysis result for SHA-256 9271fdec6b49822d…

MALICIOUS

PDF

97.6 KB Created: 2021-09-05 21:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53e8254fa1765049d4d2a71e41c6764c SHA-1: 6a42d59a11304d11b1cdab177d4646f3f64e795b SHA-256: 9271fdec6b49822d7de74de53733d89cc6e126535175c48073919b0539cbef61
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and other potentially malicious domains. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901f62ab26e---69256804667.pdf In PDF document text
    • http://influences-vegetales.eu/assets/Image//files/90561003732.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/h9q454juec0jj672n7vdbg5dqk/71347924011.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc5b1e8c8a---55555862144.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/41667059298.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/71339867206.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161209c3ac9ca7---gesejowisojapudugu.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/fjvcand625tinug7lf72tlivuo/58222739698.pdfIn PDF document text
    • http://nessium.net/userfiles/file/73590323044.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/41e220b435a97006a82711de286a8447/mazawibeligavuviluwas.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/55670644505.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73b59fbf3---varevajawexoja.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/21198983319.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/19015026324.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/dc9b89fc2237a161ba3a5af278674401/puwapakerij.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608687a13e5fe---34061461330.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091849031ef6---kinidavenu.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/gadagusonafuwodalibo.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/11444264891.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/11i8unckknqk74afa03654ek2h/19116324520.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd66d18decb---dijirafepopat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=prince+of+persia+ms+dos+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_off000115b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B9 19220 bytes
SHA-256: 36d73b6e3f7df6f0fa61f8596ee3ed552ee1efa523e0a9aa8fe0e0aa8701fcdf
font_01_sfnt_off00014821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14821 10784 bytes
SHA-256: a571fe14b8bcc0c4ba33ace0b04258503569c949ea338a7024fbfdb5ec653869
font_02_sfnt_off000160e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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