Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4eaea9791320609…

MALICIOUS

PDF

91.2 KB Created: 2021-07-18 06:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 13b82fe156743c192b4a912148ec7f7b SHA-1: 6459d381abaabe3d2bf78f94747413916a0e4aa2 SHA-256: a4eaea97913206092bdd39a02fe826dd38239ba9dd93d8484b1fc6929e95102c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://doreenindiatours.com/userfiles/file/xupenalabitedupuwedo.pdf In PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/3902985580.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db457b390b---tawijezipomixevisu.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16084084cab784---66716304843.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/f2cs260qseiktrj8p3io7qho85/monemetefas.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/sotasaz.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160714733d8c79---dabem.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/926275914.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/c7bdef8c63f2ffa1a0504701116a6f6a/loranoxekutubovapavaj.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1624059375.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/kibajas.pdfIn PDF document text
    • http://denge.aero/upload/files/13543217868.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/8bb80c874df441653f71e5fc8d9626db/95370172383.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/42012071090.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b605cb38612---15781328535.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091295ce594c---12187516543.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/xobela.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/lutividuwob.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/94661511287.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/97419737327.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c949589384---kolabapazovidi.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/3987431137.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/peterazukabelakow.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/37821356200.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0dd71afdb---87220021469.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f704d94866e6957b005caee93ad6b948/99780005197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+many+9+weeks+are+in+a+school+yearPDF 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_off0000fe6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6E 17756 bytes
SHA-256: 37d759f3d9adb5c751b437abfdf767ba0875748594c85c5de7a7c15930b09052
font_01_sfnt_off00012cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144EE 10848 bytes
SHA-256: 1704f04a6ff30a4d140163a6b40b9aadab5ee5d11213b2467e041899940b16c4

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