Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a465580b248983…

MALICIOUS

PDF

89.0 KB Created: 2021-08-18 09:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: fcc5f4713068d5f77d04fba7804f5ec2 SHA-1: e2fb94a0e9fe69c144c4af5294faefc1217ce6f1 SHA-256: c5a465580b24898340b8cb3ad8b1f9172b2109f000f330bbb2a0d75f23e9d7ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous embedded URLs and the 'Urgency / deadline lure' heuristic suggest the document is designed to trick users into clicking malicious links, likely leading to further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://fmi.lu/userfiles/files/mijukajokeloguri.pdf In PDF document text
    • http://ohappy.org/userData/board/file/tobozakepomejivix.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/99956548051.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a99c0c335490ff064e3a493201e75043/zojekiromatib.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/jexikikigused.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/89978614348.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3c47a4546---furuvum.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/17275824021.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/mupulokepagiguzuviw.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/naxokiperawijetamomojo.pdfIn PDF document text
    • http://hncastlecable.com/d/files/43330256893.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/ba3f4bf5226d340cb2db2c18f031a3f0/xewisafazix.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/99248322168.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/03db79394044e42a78e69266dea8beac/zagonipiweriviwazug.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/4270244d2bb8440c345c1648129f27b8/rutozidobosiwajur.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610f53292f308---toviloroputimofaloma.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/166f1ccfd0a74476b7e83fdc64308378/79560325825.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/83921760824.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16211353405508.pdfIn PDF document text
    • http://minhanh.com/files/74399321272.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/12266934407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+get+flight+ticket+print+from+pnr+numberPDF 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_off0000f8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FB 11008 bytes
SHA-256: 1f692419808931d49576d1b2a9a22d6753765046ce0714650f4d029e6d13689c
font_01_sfnt_off0001121f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121F 16888 bytes
SHA-256: 74a55927e81151dba677697968fbf11bb2c25250e0b317d1dfd2e372be206d0d
font_02_sfnt_off00013ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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