Malicious PDF — malware analysis report

Static analysis result for SHA-256 86dfd8343d37e478…

MALICIOUS

PDF

87.4 KB Created: 2021-06-29 00:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 381d81132491d4788c2ab8ea98450452 SHA-1: 0abdf6654c6f34c5f5c05116bf2e7a54e23cc372 SHA-256: 86dfd8343d37e478c640071910755057ef5b7fa53857cb89bbccb95631b7ba54
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file acts as a link farm, directing users to potentially harmful content hosted on compromised CMS platforms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821e4303aba---lejomibovemimap.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/0cf4ae9913c00b10917c2d8399717518/33814804619.pdf
    • http://blessingsngo.in/userfiles/files/giferisavitapax.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083595e0bc7f---nifugi.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/2b2dcf1716b31955449866a3b7bd772f/8834906051.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609708180b5e6---mewawunojede.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/349c81261626ac61ba4388c5b861fe55/sigefipemekideb.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/97975134039.pdf
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/01db3dc7fdd0f7787b30b21e5525af33/fupiwet.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ef333accb---62080348320.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1f7f34c6f---69077991098.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847145a4c85---7888456470.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/c101a95307c759fa28a3f185cf16dd7e/84578537165.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/26462893209.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076578f5c7e8---besotunupaguwudinajemudo.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a983ef812---gedavebax.pdf
    • https://avgdesign.com/userfiles/file/mikozatimadegenu.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0689160739---wagutodugerimale.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/qu0aapeqvai32bn357pthd9pf4/76457477370.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c570aa57f---ledetemu.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092186b52e39---25696930963.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/09dsom6891t4h7drm60k6dg4n6/53850560961.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/e6a5ed29a7799caf6c7c824c2ec8621e/21159951493.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=volvo+s60+service+manual+free+download
    • 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_off0000f233.bin
b0849eaa5ca4017cfc7804b17d34071a97918a57455dfc45b7a88e3d286faac4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 16864 bytes
font_01_sfnt_off00011e75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E75 16792 bytes
font_02_sfnt_off0001368c.bin
93837a8ff7f6fc970397be47a7410888f29122e393bcda44a84ab96a506c1f69
pdf-font-stream PDF embedded font (sfnt) at offset 0x1368C 11052 bytes