Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b2f93e36a5d384…

MALICIOUS

PDF

104.8 KB Created: 2021-09-04 10:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f4bbef6c576a3ad4b88c09f87a8a6c5f SHA-1: 22649f4bc1d95e609bce3a3c0d830a2bcfdb9aa2 SHA-256: 60b2f93e36a5d384f95bb10152fbbec97c0459b1fd3d0dc1e9a4da7506281883
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The PDF contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic further supports the phishing pretext. No scripts were extracted, but the overall structure and URL distribution point to a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://avigailpekelman.com/sites/default/files/file/46571973586.pdf In PDF document text
    • http://amuseonline.com/absite/userfiles/file/koririp.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/s3af1l7l45063dcft3jd6l1ou5/36273896901.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/55090597853.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b102d17d18---laxapudimixowixore.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/61392643715.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d88fce5ed---44551820720.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/fafebuvozisag.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083476d8bfe8---1157334829.pdfIn PDF document text
    • http://apsons.eu/files/file/rebijijugoxetowusikajugat.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/dotuxisewiduk.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/67939944135.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607729c579483---fifobupozeno.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/487402041305455c8d27cffeb4bcd6f6/56083408575.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/63193607827.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6985b2eb---nidefesatizegizepugadume.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd87c865b0e---18969189222.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/miduguvuz.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c33cb8070---11850113717.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/fimebejiveputenexe.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/sonekosolukom.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085aa958c70e---42095877027.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/weken.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085510dcf542---buzenuwez.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/dutemegobofuji.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/bagigupukure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=proton+preve+user+manual+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_off00012d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D22 21556 bytes
SHA-256: 3c9b97732cd1158a2331d47ffd64546a3a5f4609af9fec0d6d3cc1af917fb2fe
font_01_sfnt_off000164c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CDF 10732 bytes
SHA-256: 0295e6c41c8d3f5191a10fb6a445bee0cab9bfd63d7a2d58be98f0508228097a

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