Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d5f96cfa7ee73c…

MALICIOUS

PDF

68.1 KB Created: 2021-09-07 10:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 413e1841ff3974d5f22ed247a477bdc8 SHA-1: 161447ea4775a6bc00f2db5f793cae162d2118db SHA-256: 49d5f96cfa7ee73cb6392e628f30e18f4f90c506ea12fb7b9755d47a20f3512e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed for SEO poisoning to lure users into downloading malicious files. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest an attempt to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7032

Heuristics 5

  • 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
  • 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://queure.ru/uplcv?utm_term=information+systems+for+business+an+experiential+approach+pdf+download+free PDF link annotation
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e70752c583---fuxozefusabibikolo.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/navowizibaxulomupesa.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6a3c8367f497364d26b3023e26d2cac1/pedinofalazuzul.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/mirolanu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610698dd5fa22---wozowakusorufevavukidese.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/vubenusosakusefu.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/10642715757.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160929e486db66---30323192972.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/d82586be2cf0cc01cfc64eda9dc9d2ff/48189616076.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096621b43822---dunivep.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/55930624860.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161180a2490ba6---negiviguvazizugovomunive.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777246a520e---94297714737.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/89427307535.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/dabifubegurulabe.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16082685bb5838---lonewiruwiwabejovan.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/56ec8dt76ktvf1vatkeb1bnt6u/86411897118.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e168fbe9e1a---xoxarupodezubilebaduku.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/65938403602.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/66768561966.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D7 11376 bytes
SHA-256: df998a10c90283854626b1564966c9e6d2c78f008ade2da0ad99ff89897898b4
font_01_sfnt_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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