Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d0c57081282b26…

MALICIOUS

PDF

93.1 KB Created: 2021-06-26 04:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 269601d5ead867a6631a034fc5db81ac SHA-1: 8a926c9c3e8f3a83f0498e6a45996c61b7bdecfe SHA-256: 33d0c57081282b26bdcde71d5d51aa422f68aad8a2e1230d49075c0bc2f402fa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external URLs. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/c274ab242d5ca9a18fbb94c057ffa800/xawekezex.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/7a06886eec82e9378b8ec1f0339376b3/67729020524.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16098935ac7097---32622124596.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/tt9bgkarbak8bd78phqck67gjt/26418817888.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/aulupeiev79hgcsdnf1np75g39/widavetizogugeje.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/be79a228eebed050e16b4f2901259a4a/kifefako.pdf
    • https://brmc.jp/user_data/userfiles/files/52043256019.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/6a8a55bbd67d3084a48622081c3fd2b9/terakuze.pdf
    • https://mavibusiness.it/file/47919566172.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16080930ed43d9---lodegader.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc0f47a736---99454917364.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813812ed0e0---xugogibe.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdfc448ddd---kokokuxijumogesobapefiso.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4pd46k802heb9sv98eevd55e61/84438201726.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3f5be31d7---79116884830.pdf
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/11376056131.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c853c48579f---mezawefazexigukejefuwa.pdf
    • https://batikatravels.com/userfiles/file/51437223883.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3a56f5f06feb429fd9c777cc4c315b42/beviwejetimobifaris.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/57e8b2065691c1ceeca0d7c0d3e46aba/vedilinajazoxi.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb838c7b39---kuxiko.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070bf0a3aae4---felodokerawozujovigag.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094a13f21bfb---wuvawaburufid.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sweet+corn+days+to+harvest
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 16792 bytes
font_01_sfnt_off00011eed.bin
19a93b6465210dc4f089af767dded461de91fb22e393ef1fe06eb01203b3d974
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 18112 bytes
font_02_sfnt_off00014ecb.bin
705fcf10e68ec0e687399a66d1c5df30d22db5c23b0fb1555a2a976eaa52e84e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14ECB 10672 bytes