Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b25590074597b25…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 22:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 30dd643a27ec807da72af31bb4276f70 SHA-1: 01dea042734cac6d7c11fe8eb8507aae365b7844 SHA-256: 2b25590074597b2535e9c582cfe06db1f44691de4930f759d8b6044aeafed5ea
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://garglob.ru/uplcv?utm_term=snowflower+and+the+secret+fan+book+pdf PDF link annotation
    • http://strihaci.cz/userfiles/file/simuwotukunirodixis.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/84298662333.pdfIn PDF document text
    • http://elai.kz/upload/2021/08files/210830123158817184fs9iy.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/96765554509.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/rabevupudisiwulud.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/69553459432.pdfIn PDF document text
    • http://aurora-c.jp/files/files/993451554.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609409620ac4e---ludifi.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/melufekodeteri.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/13830949991.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b49e12a0747---79751692751.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/aee18d9608cf90750b6b7e3de2ff7994/35046591596.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/62295483140.pdfIn PDF document text
    • http://kelvista.lt/images/files/37473408940.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/jerutegiwoxerowupuva.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/mezolavakegogeluzolipiwup.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/1214891674.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/tuzumutexirevo.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/65892737806.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/xejadupe.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/51773459394.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/pozetoga.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/b2632efa649834c505a28307c1a6bc58/pamelaked.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/967f5fa8cf26a7d70635fc3b8a76c3eb/24864599060.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/94224937041.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/0394d3780bf64dc2c12f507d525aa88f/diwulenagigubapovi.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_off0000e04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04C 11016 bytes
SHA-256: a78f333ec6efeccb18c0e8a3939075a7e6c3c22573970a68d2f5e5f8fede4f8f
font_01_sfnt_off0000f9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 18540 bytes
SHA-256: 89ed17cae60f63e54c010416de6fb4fc29cc8fca0444ef096d28bfa92d69e7f6
font_02_sfnt_off000129fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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