Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac019ebe5a575dcd…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 13:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 661fa577c9a00df2861713eeb039f7b8 SHA-1: 9aa08a9ad358249549d39ab6edf996f35ca85219 SHA-256: ac019ebe5a575dcddb6c42b65401990f20d080a2e435d295f229f2e4472c8306
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of numerous links, including those with UTM parameters, suggests an attempt to manipulate search engine results or direct users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://hantverksakuten.se/ckfinder/userfiles/files/59929094406.pdf
    • https://cailux.lu/userfiles/files/82352734192.pdf
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/34992367406.pdf
    • https://mimpishiodua.com/contents/files/lajerinifunukaniw.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137b554c90bc---nolapevarap.pdf
    • https://tjp2-hotlink-j3t.com/contents/files/31064247349.pdf
    • http://heaig.org/editor/ckfinder/userfiles/files/18671087711.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/38072ba9dcebcafcd17c4f276ea9a2f6/37612386291.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161321f180df96---kitekudonufobuleloxotokut.pdf
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/7a02a0296818362aed42ef3bfeeeef42/mosujodaji.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/5f291039b8c3a6178f7a7c2bb944196c/nuwejum.pdf
    • https://pottoka.info/files/galeria/files/sawixutovuva.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386ace83307---lujiwija.pdf
    • https://olivermilk.vn/tctt/sites/aaa/file/zolejisuzelireve.pdf
    • http://artsar.pl/userfiles/file/97862595692.pdf
    • http://glina-master.ru/admin/ckfinder/userfiles/files/batuxupiz.pdf
    • http://hoaisonland.vn/upload/files/61053495157.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee4fe4b734---widanofefuwomowe.pdf
    • http://aroma-es.red/yamituki-n/uploads/files/54028569022.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/76496885159.pdf
    • http://moskvaznaet.ru/upload/files/24181076834.pdf
    • https://groupekineconcept.com/userfiles/file/tatojojigemupemuwa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+make+slime+purple
    • 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_off0000daae.bin
828725e1bc12cbf10fcb0d96b08a827b5fe35abd31fa1286c3b038498cfdd48c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAE 17716 bytes
font_01_sfnt_off00010887.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 16792 bytes
font_02_sfnt_off0001209e.bin
65927ca6f3561507fb49e95a09a1dce832afc7fe2ecf0a4c1f1235c360269af3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1209E 10580 bytes