Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1704aae0b4a8e39…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 18:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03a893cc0ab5bb348543d517ce1623f3 SHA-1: afd902cc748933f1a4c42ada0ddb166fd896fe06 SHA-256: a1704aae0b4a8e39d18be3bc7189c39043cdc8db2ed1f1ddb48c350453d5d535
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=balli+kaur+jaswal+books+pdf
    • https://nezamirekhaseafoods.com/userfiles/file/xofizukarafusirasofe.pdf
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/ximakexexodotodeva.pdf
    • http://lmleadmanagement.com/userfiles/files/fadasapogodiwoza.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16321214122724.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1614323a5ab7a8---vopitewu.pdf
    • https://magerp.org/upload/files/19013153144.pdf
    • https://wangwangcamp.com/uploads/files/202109200452194926.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613293c1d6852---rajamurinevutalusoz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e0543ef4c---vajigibusetoxaxumare.pdf
    • http://bright-mineral.com/uploadfile/file/2021090700583279.pdf
    • https://buddhaart.in/userfiles/file/jaruwupe.pdf
    • https://iieng.org/editor/ckfinder/userfiles/files/87248689357.pdf
    • http://italiangreyhound.pl/img1/userfiles/file/29632313681.pdf
    • http://stylowa-pss.pl/userfiles/file/lilafomutimabuzozeter.pdf
    • http://yuanjiangchem.com/upload/files/guretawonixuxulutopirodi.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/edd0c4b94d8ffbb65c83cd532389b319/1595206254.pdf
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/65811914993.pdf
    • http://www.ciesol.es/ckfinder/userfiles/files/satagesidar.pdf
    • http://homespakistan.net/magzine/uploadfiles/file/54909467821.pdf
    • http://zulassungsservice4you.de/bilder/file/bavifebariberejunog.pdf
    • https://portalkucharski.pl/app/webroot/media/files/wevuxapa.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b908f893c3---66022718489.pdf
    • http://symbolfoods.com/files/file///didemuvivituleje.pdf
    • 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_off0000da1d.bin
f49871c6c50ebf5b7454814ea92b9b7d8208d1c9365bbe9a432c38c3feb7fb44
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1D 10756 bytes
font_01_sfnt_off0000f2bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 16792 bytes
font_02_sfnt_off00010ad1.bin
f05dcd4514667d45216f63a2254274f5eaca71c250fb3d23ff6e4816363d455b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD1 18256 bytes