Malicious PDF — malware analysis report

Static analysis result for SHA-256 784b796990f7c1c7…

MALICIOUS

PDF

92.0 KB Created: 2021-07-07 13:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38e1a321b45b2298b12f8551193cd87c SHA-1: b82f390a9dbdff76aa368b802eb3227b4dcc8d34 SHA-256: 784b796990f7c1c7d95666f0442e0ef21281717dcb20055fcd17640ecb308026
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://am-assets.com/aom/magnolia/userfiles/file/gagefovalogufamusuji.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160acc6b88fa11---73624868779.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086f9227fc50---14016551408.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/11958960147.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a38cb7cbb---22241792989.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/a34f36b4b0acec0d873bee63fa1216d3/rabosesopojoje.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/05d51f9c323bef37e37c9484104ee916/gevojuvumusodoveleji.pdf
    • http://www.anclupnapoli.it/userfiles/file/zotabubu.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734db75f229---sijiza.pdf
    • http://isgsrl.it/images/file/1498007320.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/50172mi2rl566p9pqfeshub185/19679744132.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160902bfc3fed7---20367455895.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607978df39558---mopanokurumibonijuza.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/77997095349.pdf
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50711971675.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/1eabab99ea3acdfbac0ca8201c721df9/retobujegeleniturimugota.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ade718b4a6---wepotogadokidew.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/6d2g599kc1caut1varbib0r347/61947257273.pdf
    • http://cartopack.com/Images/file/91216255479.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754c6a8e85c---sigoma.pdf
    • https://turismopontevedra.com/ckfinder/userfiles/files/sijevonesodabajetojok.pdf
    • http://maility.pl/_ADRESuserfiles/file/55130321456.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/774f6ca06e483a7d85c4abec9a5812cc/82865895028.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160abfadd71aac---41353342252.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=you+startled+the+witch
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee93.bin
c7111fc6241ffdb978af8adade990d31693931e7f468a1dd047cc53d6b8473b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 10532 bytes
font_01_sfnt_off000106cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106CB 16792 bytes
font_02_sfnt_off00011edc.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDC 16164 bytes
font_03_sfnt_off0001344e.bin
b7e7ce7b3dce0eda7207cdd2d47ec7df34cacd12d21afd44cc962210a084830a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1344E 17672 bytes