Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1119a76dfe00cef…

MALICIOUS

PDF

79.9 KB Created: 2021-06-28 15:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a13a6c1e7660388a1614810462137a3 SHA-1: 96b1111156dabcf6b287dc8da243e8e0772e9176 SHA-256: b1119a76dfe00cef778319a1a4af9868283b22c0c4069ae6dcf00be040ea87bf
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL targets are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c941decf6e---fuxigegebivokusarodoxi.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/3qohg1n2m0arqsqvbkkcu6ci26/mizigosuduvozagujoz.pdf
    • http://accessprecision.com/userfiles/file/68229610589.pdf
    • http://akademia-jedenastka.pl/zdjecia/fck/file/99335268933.pdf
    • http://mtecommerce.it/public/news/file/bavudukiwigorewatozox.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/b07dcca38fa61edc64b1ccf085b87cea/35902470160.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2297895c7f---lezosesixej.pdf
    • http://marinapogon.pl/upload/file/navufola.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c761c2d6f223c2102b1092a28fd4bfb0/sizazozezo.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/xigufenutowakezomevixudaw.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6e190693---39314370095.pdf
    • http://apexibd.com/uploads/fck_uploads/file/37776147095.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609abc0771d0a---fusadumupanabuwozeb.pdf
    • http://stepasidemedical.com/images/uploads/file/kigizemu.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/356ab2c32b76f212b7a0cd9bc94a4796/ripijetesijugejewepef.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/p77l0iodijgo24dp8it4nunljv/63858490322.pdf
    • http://i-daa-wl.de/userfiles/lamogafaxobabu.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/15843384649.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077708ea799f---venaxibowuximizuxo.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0915bf315---nediwafezozijav.pdf
    • https://digireg.pl/upload/92605646341.pdf
    • http://slsnn.ru/content/files/xotononupevifewuwagamuja.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb14540b4b---webagesakivifof.pdf
    • http://wo-kop.pl/userfiles/file/pevugesumapojozabusajene.pdf
    • https://metricgroup.it/uploads/file/58264131806.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=to+walk+away+meaning
    • 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_off0000d6ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EA 16792 bytes
font_01_sfnt_off0000ef01.bin
0f8232c1c4d1418ee31fc6c0db59238a785239b167de025d4c5b56f7aabad0ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 10340 bytes
font_02_sfnt_off00010655.bin
c2dfdfd4418010067a2677a8381b38a3cb6271f7cff781a2514a43505c04c6dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10655 16532 bytes