Malicious PDF — malware analysis report

Static analysis result for SHA-256 5abb5758b2a2210e…

MALICIOUS

PDF

79.1 KB Created: 2021-09-05 05:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 409b91947a2aee2b789efd2a0a383ffa SHA-1: cf9608e14a65ea7eddfa2763083da703a8a331fa SHA-256: 5abb5758b2a2210e295596e21e419e21c94135ccc5619152add82782bb6924cf
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or content-luring campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e01d85299---89510075956.pdf In PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609529820edf7---zivibefatibidinale.pdfIn PDF document text
    • https://rm-parketi.si/uploads/lijuzonumuxaw.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/wapedigutaxil.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/57173275215.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/23364782589.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/85884283309.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/tejexakuxiwijuna.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/xudukukuwekigulovu.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/zurix.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de06f01ae8a---tixoluvabofapiti.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/46epkui97uq01832d4or18qtu0/43423618079.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/c9970fc1d182cc02db95ce21e4d7315c/tutopabenolakugomogil.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/97771307309.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4d3a2bd20---12020963257.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b30ce29ccb67a0921f98c86691f4951e/35949513228.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/7ft94mqloskrfbfrupbl3rcapl/12227503504.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb99953ea3b---51348608922.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/moxedurokewagoneweba.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/29498878450.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/77703425369.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/nupupodibetidutes.pdfIn PDF document text
    • http://josquin-capella.de/download/54384306460.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/185b3ac0e909acf9bbfc152f55be8e04/xezumuziz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=conflict+resolution+skills+workbook+pdfPDF 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_off0000d09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AC 17156 bytes
SHA-256: f36dc4e56e9a29fff57d1e5a409a45b341f7b89d7fb6b86aed9c655d5c2c4293
font_02_sfnt_off000114de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DE 10900 bytes
SHA-256: b0137767a92e0892b639d62a28b5f69482621f0be16b227a3e830ab4c2489e46

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