Malicious PDF — malware analysis report

Static analysis result for SHA-256 621a0033b43c1cd0…

MALICIOUS

PDF

86.1 KB Created: 2021-08-08 15:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e88b7cc9945ce59c1af27debe6e108d SHA-1: ce0c2489a79956a159976ed55477cc468c3d1081 SHA-256: 621a0033b43c1cd0052018dc273fb430a1aac89fd1fe9c3cf7c8dd281e1802cb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS uploads and disposable domains. These links likely lead to phishing content or further malware delivery, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/cjha9p2hhg2p01osev8fcfq1j1/xowubajumevaxupifupozas.pdf In PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021071606535573499.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/14105614418.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c5260a31f9f---disilakogusonodi.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/7g9nt638me13hc816dlrdjg1r7/60266827469.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/zepunewemame.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/bekikigefoxululunisaze.pdfIn PDF document text
    • https://led7.ru/file/17185699936.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/jafogi.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/ec5n1esu89jcc2rp79hb5jgjj4/boxefedafevomu.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/67654850147.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/84547a207314d02a2f6b22eb3d606695/mosasokotexuj.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e7aa56cac6d---kesogugoneguzuxev.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070822837979---nujakeforifinakebemoposa.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086f1e016c94---244957810.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/7fcfc4d7fd4404efa079a62be8cc513c/torotigunumetofofibituxe.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3208dec0b---91057284169.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb780aaa7c---45726997919.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f87c78682c---40506209264.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/37663824990.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/nfmfpbgfohhh5lsn8lac8erbc9/dodevikixebu.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/fobubegupobusebururupeg.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/sikobogulitogulowupaxuzot.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f930d73c0aa---69120978610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=why+my+sharp+tv+won%27t+turn+onPDF 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_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 16788 bytes
SHA-256: 6d2d4344161cffafe09fb31fe96f2e554e0e9f2e33233f938d26402a743ea647
font_02_sfnt_off00013235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13235 10640 bytes
SHA-256: c7bdc24e3ba7d11c83a0f540074bc73c37676d4bee3ae691d73f9f02c953d2fa