Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d17a8e0fb602c0…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 15:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ad63fe9c8200f93dadd5a295afbe9328 SHA-1: a24e04f202456b8e0b3fb2baa7313245c6052568 SHA-256: 65d17a8e0fb602c0ffee2afce2d118af72a6c0310796d7d87dec620b1fd43e9a
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 WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://harasim.cz/uploaded/files/68805827268.pdf In PDF document text
    • http://allaboutdowney.com/userimages/kalepone.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5ef2dd6da---35372955614.pdfIn PDF document text
    • https://medius.sk/userfiles/file/5508432166.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/10543355798.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/86955038864.pdfIn PDF document text
    • http://esangsok.com/upfile/files/junigu.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/74811325982.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/52106963392.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/68ab592751a960ee548e285c4eb564f8/26386292613.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8871a8d2ae---xagififetolesuvig.pdfIn PDF document text
    • http://sbkf.org/files/files/xeweradegi.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/77040753628.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/37109851170.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/91311368259.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/23c2bb283c5dd68998b872982c59f0f2/21184801668.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f41a3b38d---dibadowedisekeberakelebi.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/2561f049dbcb816aa545f75fa83d749a/jiluwazosev.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/34804569675.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/zijamezuwurir.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/gubemawukoberuzuxe.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa35b14a0f---moxopozirisisajowanux.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/73811261103.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/naponovuwoxiladirowozego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=unneutered+male+dogPDF 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_off0000d92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92B 10440 bytes
SHA-256: 508ede565ca31558ebcc854228fdc58c56b0cb57b7b6cb0f6c0d1c2da4bed392
font_01_sfnt_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 18088 bytes
SHA-256: 884f17dc201d03b48d4798a7c445e0b25c1256f81346add6c92f922ee82af065

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