Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb047d6865f9b622…

MALICIOUS

PDF

96.8 KB Created: 2021-08-22 00:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64d33638cec1a6a647c584462a43ecdb SHA-1: f4849d07c63333c9ee29a87b2b6458ab9d199602 SHA-256: cb047d6865f9b6228363d986b4a45a3e3352e754b59766e0abb5bb0a5f7bd6f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The PDF contains a link farm directing users to various external websites, some of which are hosted on compromised CMS platforms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further compromise. No scripts were extracted, limiting the analysis of specific execution behaviors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://techson-cctv.com/upload/file/93425318859.pdf
    • http://polish-house.com/uploades/fckeditorfile/95675771490.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/d8fe64e59c533f33fd86ef39c7b011e7/52073079235.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160f318d5df462---wirazikapifafeveg.pdf
    • http://www.gpe-el.pro/ckfinder/userfiles/files/zixil.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/5fe10c2dac4efc24510992666041b6d1/zabilumop.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/sbgknr7ifngjcsb6feeuemc6dr/86141096638.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5c0ca49ae4b39c7362a71d37d70ab7ee/5682242452.pdf
    • http://remobudostol.pl/pliki/fogalix.pdf
    • http://annabarons.lv/files/files/xafodaxufodisutu.pdf
    • http://mppscstudy.com/admin/usercontent/file/firalitogepedix.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09972ec719---44538468125.pdf
    • http://manavpublicschool.org/manav/userfiles/file/44539058734.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088655cb8945---92802074757.pdf
    • http://www.cbs-emballages.com/upload/file/48762537698.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610f44bf94ca6---xepigododufaxojavebigusi.pdf
    • https://hkfew.org.hk/ckfinder/userfiles/files/komedetezipovare.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c444a8942e---5509565525.pdf
    • http://uktohabbarijamalta.com/files/file/katuveromufeteni.pdf
    • http://cjandjunemillerfarm.com/clients/75830/File/suguxaxijiwumidolenixowa.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c24cfd23484---nexawowase.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/bbfe736b4ed2c24c5e47924434f6c127/22716168385.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=is+250+a+good+usmle+step+1+score
    • 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_off00010ddd.bin
da102d0a202fa6f2e07e0dcd0f283ec0ef696b319c8c25460e59b35767b9ecbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDD 20356 bytes
font_01_sfnt_off0001424c.bin
4c7bde1c439da0dfd2c2d767d5a27834e11c3e85509639fdc5e1e92018b2a5ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x1424C 11140 bytes
font_02_sfnt_off00015c4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C4C 16792 bytes