Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40f9c6ac9ff9b17…

MALICIOUS

PDF

120.5 KB Created: 2021-07-27 16:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a69fa881cedb19f92eea2c0d03811ab1 SHA-1: c564fe7d2c37c1e836b7eb21464d07b3f9bdc956 SHA-256: c40f9c6ac9ff9b173e28b83283950ed37414dd6ba94e2c8efc3af22c04a3f8fe
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through these links. The document body is heavily obfuscated and does not provide direct user-facing content, reinforcing the interpretation of it being a technical lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://ahha.az/userfiles/file/faserekimanokirumurozajor.pdf In PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a051370bc---puxefakalewir.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750b8816605---pexuwo.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/suvinabuberijoxidinom.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/1b140d252b7c2079cd643997c8ccf846/38420788704.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/mudamomixazavut.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/danafozebiripewavit.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d8475d5ae16c00a63df3474177d36a82/loxivemakimaxekatetu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/l8qhfa3kavf618ufv0f4097ibk/kixafemofudaboluwadasaro.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aade9e247ba---jabed.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/89850461374.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/93661208214.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2164b3985---kelaxapadejabawasexetute.pdfIn PDF document text
    • http://billsky.ee/files/file/gitezezopixubagotiwuw.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63252817793.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/8fb0ef954c904980cd713714253c361f/69193596857.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f3f37d8b1752f1e1ae1bc7c7b0cd5b03/seruduxisimik.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/2ecd4381bef2c0a53a8f7045ad29e849/rofazebivu.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b22f16f2b7e---59389896201.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/7389554763.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/zesigejuludide.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/pigodafujux.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/89844717788.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/viguvo.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/5c495245e558ee4abfe58ccee0d19167/zugixukageken.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=kubota+b7100+hst+repair+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17156 18352 bytes
SHA-256: e902bd25959f618b01a0748d163915bac90662d892186d1099b248da97b279dc
font_01_sfnt_off0001a244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A244 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ba5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA5B 10972 bytes
SHA-256: 433c372e9b2b1671bcc607a2f0d7b6282ce839c79b91976479fdfa88c9b7750d