Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0cb57319062350d…

MALICIOUS

PDF

85.2 KB Created: 2021-07-17 15:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc5bb9140794ddcbca014078a4f70d09 SHA-1: 43c4082da9b7cfd20d768aaa78e08fa534ed131a SHA-256: f0cb57319062350d1276f20d16eddc519b052c4fe7768ce1ead5abd14a695b28
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://alituncer.com/userfiles/file/pojomigijo.pdf In PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/develag.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/95117978030.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/33325317027.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/93679541633.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/cfa6544da4836e62b472779f455dc2c9/zowuleforudefoz.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/bezodidazafugopave.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c5043a033---40246023210.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/25855912347.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/b6da4c7ec228c769aacaa11988624a8e/3314425106.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/d64815e67f29c7b095680caf05ea670c/24261908405.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/381668045c5e5c593c038300d2505872/podabebofenikugilovejiri.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/003749fce917d73d0107ff15f02c3d54/65037039493.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/49540195348.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7027d5f1ce2261b3f888eb0a7d8617e1/67408461818.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/72197115663.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/84771297576.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/71370968246.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/vtnvirvmlccmselpp9dmncqk70/64410901742.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5016bc7455---30231639224.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/aa01f9a19ba886fc049e5cca3de13ce7/sufabazagolulegogobipusi.pdfIn PDF document text
    • https://mattress-leader.com/media/66231402845.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609d811e9fd5b---26328298179.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/1340316900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=collapsed+lung+emergency+treatmentPDF 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_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 17208 bytes
SHA-256: d3e65e66698b3523c9f88315a1be5c740b9047e6adc8e042163a96981a872d3c
font_01_sfnt_off00011632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E49 11012 bytes
SHA-256: dc6479319d1e2a055633ec4133bae371f3c91ee118feca154292ad52d0dc0fbe