Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cee74a84b753b84…

MALICIOUS

PDF

81.2 KB Created: 2021-08-28 12:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7e44f5eac88af997b6dcce12742ef459 SHA-1: fde67dd4048ae3adcbd3de6d692fdb846bec7b2a SHA-256: 4cee74a84b753b847e682b2ca3dd93f6da51f0760a2f64e02d8ace7bd9b7821f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised CMS upload directories and disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://allytemp.ru/uplcv?utm_term=bring+out+the+best+synonym PDF link annotation
    • http://viorina-deko.com/images/file/pokonedupumolatu.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/votid.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/e980e9138e10cbb943156d83f0a64ad8/74268448911.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/gffg5b6mtidj46mmcmh63b4ild/25488834879.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/1105042844.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce17c7d9ba---somokinoteg.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/jinojazupemefu.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/723ed4914cefd2dbce76c62400acef61/93663886987.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/39819225427.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b12d99fa6---31786772566.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c2a72e70d---53937760141.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/ad4143dd90bc6c7784e40a7e3c52ee0c/devexoturipututes.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b3d3574d3---pofaxituzodewolik.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210823212830.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5cf2464daf---47890398042.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/jinenom.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086806e14ff3---85138203306.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/b0ec331f267d1e737a5f03fb1c016cd6/18402001040.pdfIn PDF document text
    • http://keitbg.com/images/files/limedepivojinidaxali.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/lojefafitenujugezugudoga.pdfIn PDF document text
    • http://ombs.ru/uploads/files/jegatudexemanuwub.pdfIn PDF document text
    • https://tmtteks.com/files/36015153899.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a05e28bb46---zukigejasutumufari.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/bufatitowatekisugupidu.pdfIn PDF document text
    • http://bronia.org/userfiles/file/topikonoxo.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD945 10756 bytes
SHA-256: 424885153ba12dedde16d37b0bbb43062cf67c65db05889f82fe94aed5e5f679
font_01_sfnt_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 17068 bytes
SHA-256: abaf38cbf8bc029f5623920f289b262a24ee11e5d938b0cb738f912dad8adda8
font_02_sfnt_off00011def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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