Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea2f6c52bd8cbd7…

MALICIOUS

PDF

82.8 KB Created: 2021-07-01 13:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e20583c293fa87ff759a9ff9268f3c6c SHA-1: e24cbbea65bf86579975c5c4a8239c24603239fd SHA-256: 3ea2f6c52bd8cbd7c8143d1f4d073703355ef0eb0c007a29d5c7daf410ae9a2c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress installations and other disposable hosting. These links likely serve as a distribution point for phishing attempts or further malware downloads. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://garglob.ru/uplcv?utm_term=our+culture+is+our+identity PDF link annotation
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608452e926c46---lirabimamuketulelibusonet.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ue544l2a42k2qffs0knil7vum3/zawesilekotevoribanixa.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73a6ba09e---tenopamajubamewulaz.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cd07f96cc0a---52232309951.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a487e703---69446373034.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f529cd722---52092955136.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/dewopazegisubimuwir.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/gl5e2iqjvpbnu3l3gk1qhc8il7/sazekutadenomawa.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210627082841_204o3a.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da9462e6e6---newudixifilek.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/f942bce28d12df42e58702853b1a8856/pupuxopujomojeborasamaxom.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609032c4c3bcf---vozim.pdfIn PDF document text
    • http://e-district.org/userfiles/file/42635119436.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b9947a048f7---97495721679.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c22cb06f---xuxen.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f3081993e---vifukonakidobopilezuwus.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/xivixamigixeno.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7aa1a73daf---femisebopetiwakogulidakaf.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/repode.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7d6e13b72---88813506644.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/8441340384.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/61264418973.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF93 10440 bytes
SHA-256: a2bd1b3eda9b2ca59dae84b53db6aa896aedac646375c2fd08f860e09de973ce
font_01_sfnt_off0000f767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF767 17248 bytes
SHA-256: ec41c95346ebcc0ea5b0a82acf16fe9f01dddb8d5550ad434187ccfac51e2809
font_02_sfnt_off000124ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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