Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16a1bfb1a242458…

MALICIOUS

PDF

90.6 KB Created: 2021-09-01 18:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1dabf6bb8b920e9789cd7d16073cccaf SHA-1: 6a18ab5cd6c2215542abdaffb626c73dd00ad81d SHA-256: b16a1bfb1a242458f88cfed37342bc9fd1ed04ce7572a8533ae35f5a1655cdbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics and ClamAV. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URI links and link farm indicators points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://wastran.ru/uplcv?utm_term=cooking+beer+brats+in+oven PDF link annotation
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4006aed9c---92564868791.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/677a9fad3800f2f6fddf27a1a6d0d72c/jawaweto.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/depezinukap.pdfIn PDF document text
    • http://www.siposferenc.hu/html/sites.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/bufizukafirag.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c371c0ef173---jatozizudevimolikovitevuk.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/foluzukenogopuk.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/28809693006.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b657fd226b3908cd881388409cc21eef/80804945516.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/eba0ac0984b539f46b1dc34e90ee7f33/padepepuxuponokorazenu.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/dakaxaluviveguxokozev.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/35288680599.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20217171043168883.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vnhjf4hcrb4c5dsefbl2ub38k2/90975151252.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/kavaxurif.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210603141015_NzgzNDkyOTYwMzY=.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/a2d646dad9916d9c85839855b11b1157/derimigasu.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/pcb0pgbpok6m809mkimjdubcdj/pitapobofuroletub.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a625b3c0850---82483595950.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/4956339497.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/dulenafedobajof.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/28061072049.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/salorenexidazenepoka.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/90dfe94091ga5s4nbpre7aqvti/xoxuwi.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_off0000fe45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE45 17960 bytes
SHA-256: 2dbcb54e20b1005254ddddb07637cfe57ffe913c26bb31076020d27fb73265f3
font_01_sfnt_off00012c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C25 10564 bytes
SHA-256: 958c530f7b1ea0f59099256e258b6b51583a1578364c3380482f40c2a614a48c
font_02_sfnt_off00014481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.