Malicious PDF — malware analysis report

Static analysis result for SHA-256 f275e167b07b8569…

MALICIOUS

PDF

92.5 KB Created: 2021-09-05 16:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9e658fb59553e7e6ea0c68333e280c21 SHA-1: 372bcdb7c39a6ec94dae9d09af0b9f307fccbab1 SHA-256: f275e167b07b85695a3fc9c40e5664717e2ccc989a104fbedb275c87acd4c35d
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and trojan threat. It contains a link farm pointing to compromised WordPress upload storage, likely intended to trick users into downloading a secondary payload. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit users through deceptive links, aligning with spearphishing and malicious link tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04d10b4b01---55921676854.pdf In PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/73397908696.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612346181ba82---3039159760.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qf1mpa257rpptnr3out1fvqdds/gibekukixesopavokigojikaz.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/1995231510.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210719_062535.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/42392834365.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/rosagesuwolefumo.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/wupovesa.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/achmseshckbfi55c87dii6udb4/5300493792.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/47834938352.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///paxajanugagodijugawakifok.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/c4dadb87c8c796b625cc77313f1850bf/rulolezunigokedidakajo.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607998c73cb8e---10876076395.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609888ca1e0b1---fudodexukekexazifofub.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/26570020904.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/a7182523b2e076ed737215d7d71ef52b/mukokoponubot.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c24700d6103b5102d0eb17111b3e426b/pikerubexasevusito.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/d8e94f63692a02794a8c61a508c129d2/78289357206.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/595009020.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/xivetururavogi.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/f69e6528672ec2509a4a5574cfda56e1/6214874589.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096b2899badd---lavazumugoxefo.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/gawawubezeropiwoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mk+pandey+analytical+reasoning+pdf+free+downloadPDF 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_off0000fbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCF 11080 bytes
SHA-256: adfb303845112585a20d5b7c5d3ac8b663fa493c0e103905d4eb79ca51c8fa18
font_01_sfnt_off0001159d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159D 20712 bytes
SHA-256: 433d6f7c0b253fd2172a20d333590cb4e48c2ab521e9db8fc294cdaa35cee587
font_02_sfnt_off00014c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1