Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5730d94d190223…

MALICIOUS

PDF

77.5 KB Created: 2021-07-22 18:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9fd6e2bb861bda533b85eee3eba17f8 SHA-1: c86e23b37df61ba1b454228b036a35b99656f915 SHA-256: 2d5730d94d190223185a7718ceb39dfbfeb1e8b705445c7d4c4cd5aac82be2db
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://asianmosaicnyc.com/userfiles/file/1384566040.pdf
    • https://fokusmedia.com/images/uploads/55090841078.pdf
    • https://aymsoft.us/aym_image/files/84450675141.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bac84d75765---vifubi.pdf
    • http://albino-pitti.com/pub_img/file/rusavakexewosa.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793c454f576---77550137855.pdf
    • http://curry-box-deluxe.de/userfiles/file/kixatusajol.pdf
    • https://peptidturkiye.com/ckfinder/userfiles/files/51589442655.pdf
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/loleposujepenimegux.pdf
    • http://soles2walk.cz/data/file/lixibuvefizaz.pdf
    • http://rialta.ie/userfiles/files/61677372743.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085667c50458---wobajirisovagewuzelawinen.pdf
    • http://wenxuezj.com/images/File/famudez.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/3d247ad59b1e3330f1f8e58c36f3bd28/fepemupi.pdf
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/nufixobofuturixalu.pdf
    • http://adaviestransportltd.com/userfiles/file/pelezomegupadinafesovogup.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c5b1893c6---dizaroxilukob.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a2c6a1065d00ff14b958f40e68033ce5/dovol.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80e05a224a---zotasevuludotokusikevawet.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=scroll+into+view+selenium+java
    • 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_off0000c6fb.bin
4f878f8d1c5eddf230deb01884d86a079e3b955ec1bf2476c88b02e73234f94c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FB 18380 bytes
font_01_sfnt_off0000f6d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 16792 bytes
font_02_sfnt_off00010eeb.bin
a0e9727d505411f851399096faa66592d96fec969221ac93a3df1970cecb81a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEB 10848 bytes