Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43f95160da5a9f7…

MALICIOUS

PDF

85.9 KB Created: 2021-07-01 00:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1be90564b8f763c903ef3fdbcf185027 SHA-1: c273e85e7454d8c042e808126d5ef00f025ca484 SHA-256: e43f95160da5a9f746fa7f4ef6e08532351a4699714d0137a679f520e18bcf1f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document functions as a link farm, containing numerous URLs that point to compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The presence of multiple distinct hosts and disposable hosting indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://nomylo.ru/uplcv?utm_term=how+to+build+a+chicken+coop+stardew+valley
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607290dc6928f---jenukoratigufezoluz.pdf
    • https://mimpishio1bet.net/contents//files/ligibalivexiwigemotusal.pdf
    • http://atut-biuro.com/uploaded/file/zumeralaziwez.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f7aeda84cd02f8389a416712bcde0d1f/22268470183.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b65922cd9---nuxosi.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbb8502bc7---gexigigasejuxato.pdf
    • http://al-bandak.com/userfiles/file/82375508092.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff36d6338---tavekobu.pdf
    • http://innotec-industrie.be/userfiles/file/60347749298.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/bbdnpl098iqp1pmb2mhfu2eeb4/89841099170.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c211199828e4a7fa36eecb9a87b16fb3/12558106193.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906b5c0adec---19114759155.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608735d01b38a---sivemono.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/92706e1007665a482290dc19c7cead0d/vojug.pdf
    • https://vegas-shop.net/uploads/files/47033637054.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/eb75284e5a82f94d812f649be41168f3/vejofoguvutinafevufulun.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070873b58ef6---dubefizufunati.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784ca938b8d---87456197145.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ridrgaq2ebork3rs2vmjl60m43/jofogavonimagonivufi.pdf
    • https://dodatnagarancija.com/userfiles/file/41847105362.pdf
    • http://sushiosushi.com/uploads/files/dosumezepovoseriku.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607443f865b0f---noreno.pdf
    • 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_off0000ebd3.bin
09ab4a340cb76c6d90c71d6bd01e5da4ee7dac17eff9ae112395cc57571c1062
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 16980 bytes
font_01_sfnt_off000117f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F9 16792 bytes
font_02_sfnt_off00013010.bin
03c0180b85ca838320abfb06831cb03d3018bf311ef29a9c73cb693f6bcb5071
pdf-font-stream PDF embedded font (sfnt) at offset 0x13010 11200 bytes