Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d2cb4ba8ca10aa…

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 13:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cbbba298840b1938a5a8ee74b5dcdf95 SHA-1: 24bd1efaad4f8c0662091b5df4a768dc9b9c3630 SHA-256: 17d2cb4ba8ca10aa15c68a499be85d80358926e518c7f4a9f7f24601a3dc3f9b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Numerous embedded URLs were found, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/rofumevugusurilonax.pdf In PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/87842845417.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/gerikilibeximani.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/gaguwo.pdfIn PDF document text
    • http://weingut-suppan.at/files/41324729357.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9a943d2c4---67885216453.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16137c3fbafe45---24860788363.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/31117575023.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/raxogaxome.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/79f0a357e7ba851fbda4c781ec56b41f/62219672857.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/86073230346.pdfIn PDF document text
    • https://artenika.pl/fck/file/daxoxaboguzuk.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/nolinovolijutewomu.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/pezale.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/pifibinawoxunuzuzax.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/pafuturavapezorir.pdfIn PDF document text
    • http://samtekelektrik.com/files/porafutipuminirurisojuri.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/mufujagorujo.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/gofupu.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/55387108071.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210910072434.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/kunimasubafumodogapis.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/rikazotebizemugolejorami.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109130348228995.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/aff8d3492ed8909ebd686ee6356fa5cf/6986352709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+amazing+spider+man+2d+game+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_off0000d131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE948 10968 bytes
SHA-256: 761208ab5ad229221a9e3a2251fa2c52aeb09a15f02c5a44de6f0b4a83e8c2bf
font_02_sfnt_off00010267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10267 18064 bytes
SHA-256: f9e9d72ff7c7b6748c806fe071cfd3eb0f1ab25ddbb7167e6bcc00832d2925a6