Malicious PDF — malware analysis report

Static analysis result for SHA-256 372c993c39a3b799…

MALICIOUS

PDF

68.6 KB Created: 2021-09-26 01:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 710aaac00bac125998e858cc45fdac87 SHA-1: 965c6ae01208cb86d5e7c795da93c41df8d96885 SHA-256: 372c993c39a3b799f2066b15141dd96e4f21463ef52738240b1591a74a31e97a
176 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Multiple heuristics indicate it's a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://tataservice.it/userfiles/file/tiwumiwagag.pdf
    • http://cpghollywood.com/userfiles/files/sapim.pdf
    • https://dadrarad.ro/userfiles/file/41204018751.pdf
    • https://landtop.com/filespath/files/20210918130536.pdf
    • http://lovesushiscv.com/uploads/files/jetif.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ed11eb00336ccf586ef41dee87a828dc/kuzejodegu.pdf
    • https://greenboo.vn/uploads/files/95587385218.pdf
    • http://vitalbafitnessclub.eu/userfiles/files/pazurizit.pdf
    • http://poledance-chrudim.cz/files/file/junuvolisajunemusuwifate.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366fc2dc6bb---18850962840.pdf
    • http://mc-opony.pl/files/file/64756053234.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/78422765227.pdf
    • https://thefertilizerproductionline.com/d/files/bonunawapinixolixaraxe.pdf
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/60467591963.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8e1a7761d---fotador.pdf
    • http://healthywithhart.com/res/file/fitixubimumakulenobudoved.pdf
    • https://deniz-sogutma.org/img/userfiles/file/bedaravexomoxujejap.pdf
    • https://tapuionoticias.com/ckfinder/files/32280564316.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f673df9db5ed47822f522e6771d0ef44/69525456775.pdf
    • http://jagdrevier.hu/upload/images/file/lelujifaliwiwizixefe.pdf
    • http://guitarenko.fr/img/files/68091057367.pdf
    • http://elma1.ru/!upload/files/kegeli.pdf
    • http://ownlines.com/upfiles/file/gadusekupilepoxijim.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=teddy+tamil+movie+online+watch
    • 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_off0000b0b9.bin
777e463635169fc103f253f21a4d63f0b1039a463fdc5771c350d6792855c250
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B9 14384 bytes
font_01_sfnt_off0000d478.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD478 16792 bytes
font_02_sfnt_off0000ec8f.bin
db480f5ed8d6d6e70606d1791730e6f520ea7ccc713ca7738870c478adc147a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 10596 bytes