Malicious PDF — malware analysis report

Static analysis result for SHA-256 d086540ab24f5ab9…

MALICIOUS

PDF

76.0 KB Created: 2021-06-28 00:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 357370087829abe09642cc154e6ca8d0 SHA-1: 44a5bddd5c54adb595460f5d95eb972f6c045b2e SHA-256: d086540ab24f5ab90d4e79f7e8a709fea81d45cc20fd306c6910fd18a06849dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The presence of these links and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b56a67e79---76107994911.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/manobokapidevojale.pdf
    • http://lafayetteconnections.com/clients/52818/File/90214139636.pdf
    • https://rumahbaruku.com/contents//files/xadeg.pdf
    • http://www.iece.in/userfiles/file/30707186213.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e80f4e70e---ruwerejekaniniwevuxe.pdf
    • http://elma1.ru/!upload/files/68729265048.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ff5dcltuilpqcbk88ah1h89s75/87530452810.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f76db7d091---dezonujenamiwukar.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b1f1e0df6213e43a6205bd14da5811d8/70918377667.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ccee8ef2f6a---74278895850.pdf
    • https://nada70.org/userfiles/file/wazoduzununaxoxapujur.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770ef9d8c02---62194445185.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7708db2e7c---bebafazaz.pdf
    • http://al-bandak.com/userfiles/file/pezoweligefuzeduba.pdf
    • http://tragadsonisurat.com/ckfinder/userfiles/files/93519166313.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/74e627644fa08ddadfe304379bb4a648/63363978859.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e189827e8---77581708299.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16091320f17190---46148658585.pdf
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/jagogoledanafifopaga.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/fru6d6o4bn1g725gu9daujcdma/26232487230.pdf
    • http://desagresbrts.com/clients/34568/File/45355039041.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pdf+converter+free+software+for+windows+8
    • 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_off0000c5e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E2 16792 bytes
font_01_sfnt_off0000ddf9.bin
2bbbf7837e24f1a7c15dc57e27a7ce64d39ba2a6c0bb920226981713e9d4c0e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF9 10784 bytes
font_02_sfnt_off0000f70a.bin
33805d23d94acfb184060d53b3e622dea02f3273d5eeac7af235be8b291fc736
pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 16244 bytes