Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f7967cbf600a99…

MALICIOUS

PDF

90.1 KB Created: 2021-07-01 15:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca9e24b10762e0c58cf29cbb773f38e8 SHA-1: cb507571eb3c2e8b4b682c99d4936d3cd8ea8bf2 SHA-256: 75f7967cbf600a99422f19a4fb49b9816fed574300a03ed631865d3a87b11c9f
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The PDF's structure and the nature of the embedded links suggest an attempt to lure users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/33c35b82ee4cc9d63d62a07646b8ad79/68196557278.pdf
    • https://gulyaskantin.hu/uploads/frontend/files/wipugolapegorinu.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba859ef23ab---dozubob.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87a492dfb---54082777560.pdf
    • https://surupaceanu.ro/ckfinder/userfiles/files/nomamiga.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fdf025ad7---bigezit.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091d92a74cb7---72338861139.pdf
    • https://primer-spb.ru/files/files/javoragezedibulogi.pdf
    • http://nktrading.qa/file/files/9534132995.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160824b9c29b5a---zejojitevuvogasofupulakan.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc22679190---82385064018.pdf
    • http://hysansam.com/fckeditor/userfiles/image/gewoxuwilebabevulaso.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/k47shf265r314m2373i6mjd7os/68203437334.pdf
    • https://chiuman-hk.com/images/file/83905743303.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c4723e7276e9d4281d9476a1f0fe3dba/bikinurokasojuwutisa.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8dafb11a0---68586933321.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/d3df72bddbe772121891b3f5e79a9ceb/44225044702.pdf
    • http://arohitourandtravels.com/userfiles/file/guvelexenafejab.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080579748fdc---fojalenuv.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eac01c4663---najoderaj.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078245d2f75a---vitudefu.pdf
    • http://daotaonhaccong.com/uploads/userfiles/file/67727124098.pdf
    • http://sun-eko.eu/files/file/gufujonogaw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=top+hollywood+songs
    • 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_off0001003a.bin
d63eb5fcfc2b5fcc70aa26871300794f0c7ae4f4544d5d85be6568d930b5dc86
pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 10248 bytes
font_01_sfnt_off00011707.bin
2d9b51fc7f2998798ed64399326bb7ee036d434fc807d5dd3ce0616671e5e93b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11707 16960 bytes
font_02_sfnt_off0001436d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1436D 16792 bytes