Malicious PDF — malware analysis report

Static analysis result for SHA-256 82681098fd73f9d0…

MALICIOUS

PDF

91.7 KB Created: 2021-07-16 00:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9f14b81b0b9785a754ac8b143b1ee7ea SHA-1: 76d3fe0d60136afff357c90c85d415752c75b64c SHA-256: 82681098fd73f9d02d2ba893c2c0613edb912c77fca6e25f29e7e937ee42b99d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/a9ec0c3af04ac046371ac0925a1ab0af/tutirasuzotonubujabimosu.pdf In PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/guseva.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/sj49johil92m95sdm866jhtf45/luxeberazulunaxezodawezi.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/85956794670.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c00f4e34792---53659852970.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/66331004231.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607473b6afa04---39757461197.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c687c44a42---57309040406.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/53942017473.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/xeporeferazojimimiregoni.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6217a27f2a---jogagexubabeziw.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ria33lbuv2662i356pb1e0khj1/tuzatetama.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2eca7404e---40266675259.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b00b3df413ed3410f847f0dafdbb4ecb/gogutatululorivagiji.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/9756396327.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/tiretozosabu.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/6asb8jmjoh0hctl5v2udvkrk4r/31971452431.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/14604398027.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/89781950109.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/16952718639.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/jamorojajamobegofejof.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/7v8svefbe0bril5vp7l5ub6v94/fewalikiloluburulid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=systole+medical+termPDF 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_off00010458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10458 17132 bytes
SHA-256: 9c84f9a543e9f3552562f05013b104f450be6343682d8e7a72bafacb06a9c195
font_01_sfnt_off00013151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13151 10616 bytes
SHA-256: f71b9110a2f4b136ad41ad0d5edc641bc6b3128f2895545ca07a662d4334f1ee
font_02_sfnt_off0001499c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1499C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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