Malicious PDF — malware analysis report

Static analysis result for SHA-256 750a7a63fc1f1c06…

MALICIOUS

PDF

79.1 KB Created: 2021-09-04 19:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c0a28a5b54ffb4ad7edd4babf1f029a3 SHA-1: 86a0a3e90b8f677dde31b2d1048aa4f29ddba5d3 SHA-256: 750a7a63fc1f1c06e7ec8bfa9cc9bf8ef23743abaf58a40626ce6703a4eb6bd7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and does not provide direct clues to its purpose beyond its structure as a PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e43a24470f---tawojiwavufusikonire.pdf In PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/23094504748.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vbrqoqh6pn90o5sn0d6qij9vh2/13737554307.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/14159842408.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/42422934796.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/74116187304.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99ff9084f---gilusepufebodi.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa75d5b52e2---wozexakiroxobaguxak.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210710180606_fdk61u.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/74055117169.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/vusolupazafimiz.pdfIn PDF document text
    • http://vejwun.cz/images/likugenewakilanevokedesek.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/jupeke.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/29072900930.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/86831518095.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/79288692335.pdfIn PDF document text
    • http://usa-ex.com/kepijoxexolul.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/fojitoxuworamo.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/xunijazarajesujiso.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d215a19de1f5802f33dc7f6e08050546/tutalemefajarololal.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097bb7eea861---47032217671.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/masujumesedisesiwe.pdfIn PDF document text
    • http://caythuocnam.org/images/files/vamegasalen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=flexography+101+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_off0000cfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC9 10680 bytes
SHA-256: 1d0f013468047040f71701310150c22041bc69e88c45d1e5ea51dd256a5b24f3
font_01_sfnt_off0000e837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10049 17940 bytes
SHA-256: 62afe13dc5530b812f3d24e6f800d6d6b4cf8ad7f8efd468b7b2009889cd3905

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