Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd2a648cdf58335…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 19:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20a7aa88a870f6100a51daa5117de6ed SHA-1: 2af784988198f5bc08dc67d6ac54a8bc9b1716c7 SHA-256: cbd2a648cdf583358e69f52de8bc51b370dc2485652a6bb50b4a5e8e388fc87a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristic analysis indicates the document functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains. These URLs are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=come+inserire+un+documento+pdf+in+word PDF link annotation
    • http://bagiez.com/userfiles/file/gapenuru.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/defisisedizozufotexosa.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/26716183455.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9b0939008---13793930539.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/npg5i941cqul29ibbrfa2ptvs0/gesazutigemowiroje.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/41608185612.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/bubarezo.pdfIn PDF document text
    • http://clarasonic.com/upload/file/fuzapeguk.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e28b8810af26f594005108f98b1f8bf9/2140990417.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/46a5e21f1b4bbcd828bf5b32a77f0fe8/tafasiwanesijotasufax.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/47566425840.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/wokuvovejezitevivum.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/viwoxedarojexolufelabi.pdfIn PDF document text
    • http://bankerz.in/qpic/files/80690893807.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/85972545153.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/39286526863.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b10ddd7489f2d76fe9574956a16ce623/resamipavaxedafu.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/kozofusudajeji.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609621882740c---27267267978.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/sabiguke.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/ae2be8a24df61da13373fc1ea41d3d7e/rezelimitukamelarile.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d30a8a48db---nafojalurumujovejukov.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d79b8609ab0---80109764834.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8c833aac1---jutivuv.pdfIn PDF document text
    • 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_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 17612 bytes
SHA-256: e9ed94379b1d2b103d2bed1f51b904c1e505bbf36eb3aab14afab30786abb311
font_01_sfnt_off00010ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD6 10788 bytes
SHA-256: 2cdd1e2f6288ce6f8ebc6e08bc8e600b38b7cc37f5e268da14aa866de91bb0ca
font_02_sfnt_off000123c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1