Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e7a6cd97991d85…

MALICIOUS

PDF

105.6 KB Created: 2021-07-04 00:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 972fc37ebab01aeb9342e664c4ebe75b SHA-1: 004d135d6252b9d9e0ade7e3dbb0f423da024048 SHA-256: 71e7a6cd97991d8583f80303f4a4858213d2518b4599891fa5e332a0aebe46f1
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further malware delivery. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/h0ms3enpvonq2vg6h0iottqvh1/93720625978.pdf In PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/ropomokisisapilofe.pdfIn PDF document text
    • http://timebymtm.com/upload/files/xikutepanekabimarodupu.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c121c7d9f37---libojadabokapotokaligi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080d840e60d5---75465567404.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/7261fde6d4bf3f3c1b4bf1c96f7a3e22/61192894470.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/pupavamejuli.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/32442464805.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/t99bbtj0hj8nvtikns1hhdihng/7090473755.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdfac23398---sidojilebugep.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075a9c14a4ee---gujetuvomegareku.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e26ef2a8a---7018722176.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/cf573104461a12ac8da97c6a9d7df147/tamom.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/befotemomanozedoralanuf.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/vokugigib.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607150a3eb854---23847381377.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/81617485608.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/46005770071.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/46862899135.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884a71e774f---28279457641.pdfIn PDF document text
    • http://polkovnik.su/upload/file/70198543521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=unequal+distribution+of+wealth+meaningPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC9 18812 bytes
SHA-256: cd76f4c6e638985d10828ac902cf52ee8c2a45cbe878c867793bc99264e99d61
font_02_sfnt_off00017f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F3B 11280 bytes
SHA-256: 2759c08aed2c5d34cc6839d455e947fabd97e5b5d039bfae0222d0a4f68aa4c1

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