Malicious PDF — malware analysis report

Static analysis result for SHA-256 1122b0a49c711258…

MALICIOUS

PDF

90.8 KB Created: 2021-07-04 01:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb64812b1b8383be8c17aa6b930361d6 SHA-1: ac8cbbebfebdcc912774364c290145f9e1d0a4b7 SHA-256: 1122b0a49c711258117fb83bb59c67741677fc7153cdb76e71db5f2706999737
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, some of which are hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://agendatourvietnam.com/hinhanh/file/14243487821.pdf In PDF document text
    • http://vivo-mebel.ru/upload/file/ralulupixidiboxerilove.pdfIn PDF document text
    • https://scriptdd.com/_file/file/3107327657.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/d54c6m44grcvlj1iuu7uhnpk94/13313754106.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/41041877041.pdfIn PDF document text
    • https://sealskinz.ru/files/file/pukavajiz.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/menedonugo.pdfIn PDF document text
    • http://bakoca.hu/files/file/9927964928.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/a58f0225682ad3a149cb87103e07f068/39134235396.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/toxakobadoxavo.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/40059085928.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/8112fce421c912765cbf9be2947333e0/60574004334.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/fezijipofabalolozo.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfbe1f851b3---68934896909.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/zikibedefesaji.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/17150777149.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/mln8iu81ul689co4adt7grs639/vosesosejuzusotopijir.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/jizanabobudu.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/f8f21dfca30d9a45b67bb7a184aa6ea9/josixobojogipalabizul.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/70600784283.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/dakatumopusoweniduriwufut.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6036765fc9---tajinabomikubivizoj.pdfIn PDF document text
    • http://aimic.com/userfiles/file/87092034772.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/12365266455.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/b33d885c6cf7bb2d01f0d85a339766f8/50093767905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ages+and+stages+questionnaire+social+emotional+pdfPDF 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_off0000fa60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA60 18500 bytes
SHA-256: 82f75a0c68adae69615f961baa607d76be23a9ac0ebe0a9c442de2f24d15171e
font_01_sfnt_off00012b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7C 11192 bytes
SHA-256: 204b0eb62677f2ab1fcb678ae0cb0eae11f58c010a4669fc408cba079529ea5b
font_02_sfnt_off00014531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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