Malicious PDF — malware analysis report

Static analysis result for SHA-256 3520d5fde7203cb8…

MALICIOUS

PDF

91.0 KB Created: 2021-09-10 04:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 34cbcd4ff700e10818497054908bd1dc SHA-1: 46ac056f5c70e5a56aaf2b0928d5761bd0cb46bd SHA-256: 3520d5fde7203cb8dfc295db2c7c5808bdf9ab9adc7746b9a880a06b11860c36
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and other disposable hosting domains. These links likely lead to the download of a secondary malicious payload, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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 https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/898605580c01aff9c2777ab4e007006b/mavujo.pdf In PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/90650215406.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/55147432369.pdfIn PDF document text
    • https://digireg.it/upload/ridakeveju.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/bupobogadirotogugukezoko.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/8186709899.pdfIn PDF document text
    • http://willbramephotography.com/91839011029.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ebfeebdee---54355688411.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/1585961004613a5befc41c6.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/85717366351.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/nekizebe.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/xonikoroseki.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2db7513bfbbd88a744e1ceb006fc02a1/dimujukukomepumex.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16130da04c8706---98350020161.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/72447586921.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/464df0c1d1e3c45161babe960172179f/rofesuja.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/watokawuni.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/91146433985.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/30613600021.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/gulanafamutukotoxude.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/l3bgu2fdqfth9813nes10f2pgn/lolavedafenawaxidi.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/93714363095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=indian+number+1+battle+royale+gamePDF 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_off0000f64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5D 20880 bytes
SHA-256: 3f7997012631ac5c95eab9b628046ec6f03d77c2c59176a3f28d5d85f57f4d27
font_02_sfnt_off000145d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D0 10780 bytes
SHA-256: de0480b525bb9e1df435ecbc44a934343e9982352d8a9af20a23df89c40592b4

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