Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61cf4662984e680…

MALICIOUS

PDF

80.9 KB Created: 2021-09-01 10:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c7ba7842a3f5cf893a87b2436221317e SHA-1: ad232cd2b7adf6b83c91e587a9662308f01a647d SHA-256: e61cf4662984e680c27d79c719dd87bdde35a0cc183c8f364a0e19b8d3c6de06
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly suggest a link farm designed for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9359cc8ca2---10897996453.pdf In PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4c0677df7---diralojud.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/69561970979.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afaa1b8cad---70617535443.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/63630035890.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/dc5726cc47b28c820fe34e35353ae7bc/xebafaturoki.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/33442000098.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838a7fd586b---86316756138.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/524kat6mi3m5k1lir6kkcmbg42/55053457081.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096455b4acff---xuvebinozubop.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/66144946517.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/44193082148.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/mikenakitakaw.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/38ac34a3209388a1ad40aa2ee91284d8/jozul.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/2807329048.pdfIn PDF document text
    • http://haki.vn/uploads/files/67830623984.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/53747160523.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c73a2ae733a---59555947343.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/76138763612.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/kubujojevuzexa.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/5863cc055ba44edffe017f3f5d22279a/senatimipapasovatazunim.pdfIn PDF document text
    • http://norview63.com/clients/5/59/59ba6e1aa7224642a1eeb14435756cbf/File/47270465725.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/19862527736.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/19176506061.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8509844600907688a7b66fba84d82c5f/73093360635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=leather+so+soft+lil+wayne+mp3+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_off0000cc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2F 20684 bytes
SHA-256: aa28dbcd929d300a286d833a90a77f8e416079a0262069e5960dc69a57e9daf6
font_01_sfnt_off0001036d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 11092 bytes
SHA-256: 921f1ca67d9ad771c0301178c4fef4f334f6f4004334871de829098c0ca44f56
font_02_sfnt_off00011d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1