Malicious PDF — malware analysis report

Static analysis result for SHA-256 a193f44694f6e3a5…

MALICIOUS

PDF

90.9 KB Created: 2021-06-30 00:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bad3aff4349e29ba5371a8d88998bdc0 SHA-1: eecbfceecf4a174ab0bb315a5320dee1612c8eb0 SHA-256: a193f44694f6e3a54fe65bf925dc87f7e82c5d346a29f0005df961ec0b6110a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the compromised CMS upload link farm indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=cute+male+baby+pics
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1b182c5a9---kulesonebonunijovugowaxux.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/kivugivimifodukinanefibot.pdf
    • http://wamer.org/userfiles/file/21041391921.pdf
    • http://bvsaigonbinhduong.com/uploads/files/90626144904.pdf
    • http://meble-tk.pl/userfiles/file/79712320362.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/0a28990a04bc18226f58985ab09ed194/40586208935.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a04e761c9dd1405b8649c593119d7470/tugitaxapuzu.pdf
    • http://baigeleather.com/userfiles/file/giwetoges.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/n6sf3dplg1keqd792gmgephag7/78007918748.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/7d1d648b2bc0361aa0f0991bec2daab7/depaxenutaje.pdf
    • http://rockpapersun.com/upload_mce_image/file/kirovijepafavikikunozozaz.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/78233514617.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae362659361---99595549141.pdf
    • http://www.ecvbrass.ch/user/web/file/ragijikeduvugi.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f2b3a07a1dcad4665799d1690bb7b6f1/vebejuzorevuwomafobi.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1f3299f37---19455097241.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/92369f14c63748348bdf824495c46162/bijoxejeruzekenonepowi.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/83bbb12cd06519fa2fa7916661f093fa/43374989426.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607517fe9ca07---gaposodiwututute.pdf
    • http://svaz-podnikani.cz/files/file/tofogevedinowuxetuju.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/pafevugunusugupiw.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/tigin.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160892bf423fa2---76716008105.pdf
    • https://lordoptika.hu/files/files/juwuwedunageronib.pdf
    • 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_off000100cb.bin
7d6289d7c61d4cfa254e735dae975c98a68335c5ffb4f52ffe13605732f6c033
pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 17464 bytes
font_01_sfnt_off00012e84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E84 16792 bytes
font_02_sfnt_off0001469b.bin
80a81b1255bb113d7c2835aa7cef037421ecef513b454d29148e8f6463c3b765
pdf-font-stream PDF embedded font (sfnt) at offset 0x1469B 10596 bytes