Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c93490efb03269…

MALICIOUS

PDF

81.8 KB Created: 2021-06-25 16:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c7c9747919d6acdf809721aaeb064308 SHA-1: 48ded27cf2af0401d67a6e1b43585f44cd3a2f66 SHA-256: a8c93490efb03269ba19ec220b72b8060c242883eeeed2102fe3f94216b95cc6
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristics and numerous URLs point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://webbuilders.com/files/file/josawuwefuwiv.pdf In PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/busisix.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/o35j3oskfio2fid67r11lvfb6f/dogevozubadigana.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff4643284e---notuwuzupovarugawirujura.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160981fc863f74---nivudazewig.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/89560821187.pdfIn PDF document text
    • http://giga.sk/storage/file/fogiroxekimoparotopupexuk.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/88151385166.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/67600619683.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/dd8d98cd13039fe96de2bf8a05bf4f51/nutapid.pdfIn PDF document text
    • http://klefmarken.se/upload/file/fupusutibenorefoxatalupir.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/dofilalanebamakakijufed.pdfIn PDF document text
    • http://imaginove.eu/data/Files/56984291293.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/xavemimudamerejuk.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/e91dbe331db434fe290bdca5762d6946/wesifapegorisenab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=protein+and+white+blood+cells+in+urinePDF 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

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_off0000e04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04C 16056 bytes
SHA-256: 5d3d51eb07bd28fb77d7573e003f9a9797aa8a584bbbacf210ebbd9d5d9446e6
font_01_sfnt_off000109b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CF 10796 bytes
SHA-256: bdb2a1016e9e0ad3b9bce42c3b4e17fe0fd39ec1d606682e43ac0cb3f2e98886

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