Malicious PDF — malware analysis report

Static analysis result for SHA-256 19cf269712ba7c38…

MALICIOUS

PDF

87.8 KB Created: 2021-06-27 16:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 85b1effd7afb2781069b39012cd4b274 SHA-1: c1e70870ed85919372dd5766ac147b66f94b2f58 SHA-256: 19cf269712ba7c384eb167d10341d1aeca42a4769faabfb27ec2f00a0991e1ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users into clicking through to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/e4i38fdr1oquuov042s9hejm72/wesod.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/zokuwutifabitojamepeki.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a184cce0b---56331437972.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3a24a9b8babd004d2df724db53558d42/49291097686.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bed7e60773e---87813501436.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/33552349438af546a4b83b00925356da/fupofowelukulukaragaga.pdf
    • http://asianmosaicnyc.com/userfiles/file/43065834059.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba776b9de5c---wasazof.pdf
    • http://orderkiwicafe.com/uploads/files/98490327926.pdf
    • http://hzbmsj.net/images/upload/File/13013577062.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/def8c059c645fe2f294fb34b2a0d6080/86984237373.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/kqv0kq6j7c5k7in7h4rutv33k4/83424601340.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c4ac661b---84488454040.pdf
    • https://sindonis.com/userfiles/file/18944587717.pdf
    • http://aclamerica.com/customers/CMS-IMAGES/file/pefube.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/dedb0d96bdbee3222306e470ef328eb6/kuxanedenizuziz.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983c92ba599---favopinubutazonefofibur.pdf
    • http://architettoangeli.it/userfiles/files/xebamapufexaromuxobeso.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/1989f28deb9b4d1c315c0270beb86e5a/78256682620.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607265a211fc0---sotidipopedenodopapazef.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/af6e99ac86c513304071c9f416a7ac70/tixetemotujumudataj.pdf
    • https://bursac.net/userfiles/file/81658548631.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7aa19bffe---65570654820.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/1gb9jmt3l8ebqju9bnnq31egib/9359772338.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b847bf3ffc---vefubovadesibelexiruri.pdf
    • http://beadsandsupplies.com/images/file/vosowepalerubit.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=lossy+and+lossless+data+compression
    • 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_off0000efc7.bin
ad55156cd279b92417e7fd861b54e7a3b4198ea2b554ffbe60f9f0e688f376a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 10744 bytes
font_01_sfnt_off00010878.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10878 16792 bytes
font_02_sfnt_off0001208a.bin
795d69f236991bd7f3899ec7628af50c6153de5102a88631eb9b681a41e497b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1208A 19164 bytes