Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffb1bfb53972b1c…

MALICIOUS

PDF

89.7 KB Created: 2021-08-23 11:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5557faaa51b2a78dd559345b3b72ffe2 SHA-1: 49a3563ae6543c4ce86442587c52a918b328547e SHA-256: 9ffb1bfb53972b1c5b6e4d56231d1f68978c00e1598083434475f59917b8dd54
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. The document body is heavily obfuscated and appears to be non-readable content, likely a lure or part of the exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://e-menu.hu/editor_up/3895604407.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/04f2f39ca50ef0d53cd9dd41fa777f96/75109289602.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076e87394236---nepokugojadodonono.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/37586bc5baeb78d455fae1bc24c618f8/14263388055.pdf
    • http://ca1970.com/clients/10044/File/toguzusigaxefotul.pdf
    • http://s-moonlight.com/CKEdit/upload/files/24001345034.pdf
    • http://tonyprins.nl/images/uploads/file/zopedumikugibem.pdf
    • http://heyumpnd.com/userfiles/file///vegugizolegiloxem.pdf
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/60526443840.pdf
    • http://ttccid.com/userfiles/file/42889103494.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c70dbc3fb---kibefonuzokad.pdf
    • http://travelport.pl/userfiles//file/majexasubom.pdf
    • http://matstravel.ru/userfiles/file/34982725568.pdf
    • http://inglewoodreunion.com/clients/68690/File/81805863843.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/lfd4lkqhpcgcmigvojqd3e80bo/47448716007.pdf
    • https://decoveinvestment.com/userfiles/file/93150326014.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a88e5b370---38783796594.pdf
    • https://alutat.com/data/file/zinaxotidopevasez.pdf
    • http://web68s.com/upload/files/88636010715.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc4bfe97ce---88213454124.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/35647eea076e4bf6cf5a67237f4c773f/17860114459.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8b07b5515719466b57e00aaef1dd112d/47122808815.pdf
    • http://harasim.cz/uploaded/files/figunirumotilonawo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pray+for+someone
    • 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_off0000fe40.bin
24c1ab8693f44ffec08552e85b22ea316f0658893e1669220e9c1691724d84cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 16384 bytes
font_01_sfnt_off000128be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128BE 16792 bytes
font_02_sfnt_off000140d5.bin
36239943a2b78ad04fe5a74f0d890ff007b32a41a1406b716b5ef69d6d4eae3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x140D5 10256 bytes