Malicious PDF — malware analysis report

Static analysis result for SHA-256 4991a1ce5bc62132…

MALICIOUS

PDF

99.8 KB Created: 2021-08-08 02:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 936a7c8b32148fae7fb62c931dd46caa SHA-1: 6cf0eb53002e4ba124f873c8b3064fd207e363f4 SHA-256: 4991a1ce5bc62132eb00bdc429ab8120f08737c35faddd0ab6d07a02a1611205
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608172399fee8---58179860856.pdf In PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a79034d7851---2130445813.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3c7b66124---6276407008.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/39bb210ac76559b1d39d5c69a8f11e89/36430904673.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/fopeegc0hm3mhbsfsh1bivq0jl/vekonasafiveki.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/30564905949.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/65750662549.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9dc669653---8405503818.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16100b4a2496a4---48795407661.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2c39fe0be31f3c98bd808337e51e7d3f/59168736532.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/99634066643.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/19740749940.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/60138260275.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/rexigumonikokisoxisu.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/3oie80jgbte221iu61coenbtau/fidudamuripajezovirepo.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/14048212565.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/91692178871.pdfIn PDF document text
    • https://telorgabus.com/contents//files/5335477112.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d6246a7b3---kazodidafefolepifip.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5be36a2093---19360009583.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/65291815205.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/59701845072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mad+battle+royale+mod+apk+2020PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 24584 bytes
SHA-256: bdc983a223b8aef08362fcea1d62cba1116313aafe829b31a46e99f3bc121288
font_01_sfnt_off00012f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1B 16336 bytes
SHA-256: a2ef34e2ceb547cabe987e40468e3f95c742f407daf15707e7db0dcead1b4f38
font_02_sfnt_off0001455c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1455C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D69 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_04_sfnt_off00016572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16572 10768 bytes
SHA-256: 6d1ac270496076c116905a28d2877c91dcacfa81134de8ed997f160ef136d54e