Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc838244d0d893b5…

MALICIOUS

PDF

86.6 KB Created: 2021-07-25 04:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0da6b82475824f95cc947ebc1af9710 SHA-1: 274129b93b232e90733e4ab0570eefc8bfac4a6c SHA-256: cc838244d0d893b566a17369e35677d72b47c2b8896a2a8dace8030aefad02ba
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The heuristics indicate the PDF acts as a link farm, directing users to numerous external websites, many hosted on compromised or disposable domains. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggests an attempt to distribute malicious content or conduct phishing through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://brickbodysupplements.com/newerac2c/userfiles/file/zewifufekifose.pdf In PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160e8c8d1d4b7e---37482459206.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/51463364165.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/12041047255.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/datibuvafedeborulanutem.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/gezutofaxusora.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/439035e11cbe4931ce1435c6b92fe756/61719706504.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/f42c8db9a3ec25c8e5509a639b9730f8/vapexirexexuka.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5s22pcd9ds4b5261lqgpkvgdv1/45732383871.pdfIn PDF document text
    • https://silga.ca/userfiles/file/55810708153.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/52175420083.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/d320db564b548ac73bc6d78841cfd0c8/zopofar.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/kilojirifimumokes.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/jtgjmfohdnskts5eifnp3kq4c4/84767261956.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/de8ee10b9286cd3e62871b3a68f18f3a/timenutaviki.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/m9ht6k02hufo3r193r9ln3399n/fejaxabibaduforamukigeno.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/tofadodo.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5bf60a651adc6b207b897f3d4f6a2252/73451263716.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160787e189c23f---zuxatizibovajajovonamur.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/usj9h808buqih1oi7eu9orl454/63959954916.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f67d705522---71577859588.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1255d9c996b09c103e99634313d83a27/27926346185.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/31893622536.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/74762544505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sumas+de+cuatro+cifras+con+llevadas+para+imprimirPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/46944151397.pdfIn PDF document text
    • 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_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 11020 bytes
SHA-256: ecbdc70b46ad20e3e956fc2fd42b843e4204d53c2c0605178fb3ca68d1c44e26
font_01_sfnt_off0001066c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 17580 bytes
SHA-256: 6262333321bc2f75b6d14dc009a0bc71b85713d3fe2b6baf2a0b77035df49c61
font_02_sfnt_off000132f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1