Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab5c56def2a9f3d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-12 14:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0d7ae44b66d77818c0e83b034fa09615 SHA-1: 017b9d313732c2c092331d51c496c5bb6791099e SHA-256: 5ab5c56def2a9f3d523f38b7daf60d0085c3b9d42b423ee2a4b01c9ab51c3598
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://comobrew.com/newsite/images/user_uploads/file/92455592824.pdf In PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/165a3ad3034751ce30509a311dc4574d/kovarugibusasunu.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/gotuzonawaw.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/melugotovovopedev.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/vunaxexikulitunuw.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/87665461978.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/seserifubawumukufix.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/87573590441.pdfIn PDF document text
    • http://eichler-kammerer.de/16926154425.pdfIn PDF document text
    • https://zhansq.cn/upload/file/pumepazuribo.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ofhnh10n9ip6cca5cgah924ei1/65130314738.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/32464134576.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/nidedodexexubaz.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/52677610366.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/xasoraxokijapuneramelo.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/67432796645.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/demizukasezotakutaji.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/gofidufosu.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/nerefisejawisibi.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de52b853a4---lawaditapo.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/37168794353.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/zerowutajir.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/k6b25ck596oisdpje34mvrddv4/fixabemorekame.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/7d17e3a5d35c0f44024cf5326ccc50d9/savelivif.pdfIn PDF document text
    • https://nexapos.com/upload/files/panofinigem.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/nilawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=movieswood+download+apkPDF 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_off0000d6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F2 10424 bytes
SHA-256: 04becfb5e0127c31115de5d1c6e276a12d69d8c7bba386dfddb97fea9731ceab
font_01_sfnt_off0000eeba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBA 17868 bytes
SHA-256: f55184494caa1502b68d5086c379ab4a62f4264742a791819bb7f71c1b2ddccc
font_02_sfnt_off00011cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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