Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d7b6716e5fb62b…

MALICIOUS

PDF

84.1 KB Created: 2021-09-11 14:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7ca022a408761d012223804826c25daf SHA-1: 7958e8844bd6ca198961d41a1a46760e2e57d61e SHA-256: 46d7b6716e5fb62b89645a7e439296101115f403d82f1b183266493c5a0cc76b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://psg66.ru/admin/ckfinder/userfiles/files/14425861860.pdf In PDF document text
    • http://seychelles-resort.com/images/blog/file/junelogolurone.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/nelalusegawidurunigemiv.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/73389130365.pdfIn PDF document text
    • https://questyme.com/userfiles/file/81678974192.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/tamikujewowi.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/71501149267.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/31165794029.pdfIn PDF document text
    • http://corkpotters.com/images/26052994918.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388e34e2f0a---35331622529.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/vapisadogagijuduxulikivoj.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/vutefomadabetasawo.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/65479221431.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/49343443319.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f92fe887dd---92446921965.pdfIn PDF document text
    • http://julianina.de/upload/file/34694686217.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/zurusak.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/gesupebuke.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/wejinoxavasopidanol.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/linavi.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/9874068524.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109040631278314.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/5571113080.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/84988361877.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/0sen19im0tn1n0ee9pq9227bi3/delekunupomuwonarum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=calcy+iv+androidPDF 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_off0000e580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE580 17768 bytes
SHA-256: 4e0edfdc9bd1b809bb0b21251a5a311dc5eaec4d460fe6a02cf39db022b63e1d
font_01_sfnt_off000113f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F2 10176 bytes
SHA-256: 696cd2eb32ecd9a15759465c609dcb80aa3a510a5364b2f6cb2d86a60f3a18d2
font_02_sfnt_off00012ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1