Malicious PDF — malware analysis report

Static analysis result for SHA-256 43275621dde07f77…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 12:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6466f45972669435b10115e929341968 SHA-1: 0441bfa6c18bf691747f63f870ea126287d16e31 SHA-256: 43275621dde07f7707a2e4777ad70bf40cc4fd43625bf562d3ea17c040e59667
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, directing users to numerous external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest an intent to lead users to phishing sites or download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://synerhu.ru/uplcv?utm_term=mbo+meaning+in+sales PDF link annotation
    • https://aslplastic.com/ckfinder/userfiles/files/gokamegubonomafugage.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/52090886528.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/97e3200bb3316098a1db911db36f867a/wejide.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jmogml0eh3epn9lcunh0jsacs1/moxabinasagazemelaselure.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/jamuvurelubexoxenonevekop.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/96889784338.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f460619f8---64943741510.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aac937489---95451112128.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/pomibixeburobivapaluf.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e0a08b198---puginez.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/ubtfdqv1pvn877urentbju64u0/faful.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/63834713713.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/bipel.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/mijezusigag.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/8fac4dbf0bcf361e5c1e0e3adddee1a3/34243236533.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f12d396edf---76517114343.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb9d6b7566---12035884055.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02229b8ec---lulajulot.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/ceb8d658ffb4f8802495cbdc1212eb34/97341677051.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/ganav.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/79686459618.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/43800259238.pdfIn 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://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_off0000df13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF13 20188 bytes
SHA-256: bf4f83cd81d778b8fc9788a5688202c1235b2bfaac9953e54778e62d02e352f8
font_01_sfnt_off00011217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2E 10384 bytes
SHA-256: 7708820f4e606479f2fe2de3b2896932e218a951a6492c36b9597c0d875d6db0

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