Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf71c569e1e97c3f…

MALICIOUS

PDF

69.3 KB Created: 2021-06-03 00:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 581cedc86f4505503301d2ac31645177 SHA-1: dc92860e0fb72b65dd3a7831304866cd8abd3ff4 SHA-256: bf71c569e1e97c3f2d84afdf5c0a1d0b15eb0a67f9d716d4e0fd3b06424c8a90
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm, designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://iqmuseum.mn/uploads/files/69394444280.pdf In PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/790b64d78d30262fd2270c0e75343b04/bikapijagekofodonope.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607943cc67720---xebubufarawipekapufisedi.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/vubejumutubagagolakeva.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/8f697645d72559472bc09fa4109dcc0a/vojukasujinewifidaj.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073d4635f2f2---86944332029.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/a02ed1fa143328d3520d23fde13d50da/gipuzekinu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb5d5e62c---mutanopixozanutibejaf.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/rixizodirat.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/92f60b1123ff9fc29bd7493a1729be0c/xinajatojadolosakiduj.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/zopoliweralukuvipazepidef.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16096827fcaef7---dimufifuxutebilereriz.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef3911de90---54585607474.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad5d72f86---32104184366.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e3122fa58---kubikuxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=nova+power+surge+worksheet+answersPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD967 5232 bytes
SHA-256: 0aa1e2383bb29748887ee1ea42ad826e146bcf236bb9c39f8bdbcd90f8c5721f
font_01_sfnt_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 10636 bytes
SHA-256: 8ec33a773e63b0b7d5ed22a0c44149936bd75046b911434445b008c4fc9fcb71

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