Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6c542117f34c8c…

MALICIOUS

PDF

84.0 KB Created: 2021-08-14 03:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c37a9bd5d4d6fec4f7476545eb89ea0a SHA-1: ea00fed40a0474bd16e6f5213b55f37e8fc1dc0c SHA-256: 6a6c542117f34c8c131d90514f57c97724224e5d8b998dbec1e4c0f9e872c3cd
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or phishing pages. No scripts were extracted, but the link farm structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://wccflooring.com/userfiles/files/kasagipiwiga.pdf In PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a82ec4cd---6086768191.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/712c2e6ed4923baee1215d4d50726869/tigenofezi.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/gikazod.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf27e9702e---jixebisusoxegubinafubuge.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/23818500959.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/pikujasirubiwadegulerekaj.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87a899b253---87681102092.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/nanuxelanilusafujelewad.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/toxakezesawa.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892cb947e08---gapomoxanasixuku.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/bixotag.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//6396510777.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3ccd91734---lesepigadomeleku.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bef22f43f---7542260981.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c74982e9d4d---malutububenajenilelijoma.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608249ec30304---fuxazofemezisimefa.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/10456302255.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/43421399630.pdfIn PDF document text
    • http://gptools.net/userfiles/file/vubabojovuxemubegenog.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/23642193194.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/93185943784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=briggs+and+stratton+parts+list+australiaPDF 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_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 10588 bytes
SHA-256: d3fe1c8d14f171f04ae708e4e63ca5a05b43e492d945787b70f159fa776a5300
font_01_sfnt_off0000fc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1A 17208 bytes
SHA-256: ddd619c2de85f4ee9597edc74d9cb812646c036dbb4d58ed9fa82591bbb9e499
font_02_sfnt_off00012911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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