Malicious PDF — malware analysis report

Static analysis result for SHA-256 439e0ee5d4f46c23…

MALICIOUS

PDF

89.6 KB Created: 2021-08-24 00:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f99d984566bb8e8ed15fc6fc1b2807a0 SHA-1: 70d293c92989d55ce25c464f0098d1ce3795b3cf SHA-256: 439e0ee5d4f46c23b1803e94f169f1b9c286b604931adc72070f486ba1f33bef
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload directories, suggesting an attempt to obscure the true destination or leverage trusted domains for initial distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://oicenglish.com/imagexx/files/93100654986.pdf In PDF document text
    • http://naphotelbangkok.com/userfiles/files/48386184789.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/a7702fe8fa3927b38ae3418683355ff6/23212718904.pdfIn PDF document text
    • http://cl-pub.com/files/files/kabogeti.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082ecb0d4dd8---zetuwu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f767568602b56f46df94e0c9fb54310c/fulevodalav.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/79a0483dc069e45c94a8438e007e7123/52837120700.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/dd1e8cc80c367179d83293dd3dac5d76/jepujevifeluxubam.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/42532351905.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16094a2aadec65---sugonixu.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd25c8aa38a---6748994091.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ba4586bee16d1290eb4be69faf6b4649/vazezepuzilumaso.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa4cb84719---xatisijurev.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/wosorotuketarajejeb.pdfIn PDF document text
    • http://ladakhtripmaker.com/userfiles/files/xetemuxonomepizedu.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1628622675.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/97571046085.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a083ca07f4f---10796616222.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/24176250908.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/nimekotibu.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/7412646802.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/q4iggh0gmg8shu9eccjcjig1j7/doxegafesitufemu.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/15750800894.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/678f78d42e4a7cc8522585c16aa899fc/860027184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=export+asp+net+page+to+pdf+c%23PDF 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_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 10744 bytes
SHA-256: af1c3529d5c1c88b89bafd9ab18965a971b4ed0b1feb505f608f09c3e1e21ed2
font_01_sfnt_off00011241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11241 17796 bytes
SHA-256: dec91375edef0a89a77d161def5e08408575513ff795f3590a53432273e390d7
font_02_sfnt_off0001412e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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