Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d96f555e96fdd51…

MALICIOUS

PDF

86.7 KB Created: 2021-08-03 18:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a5bffb7cec7a269e7a877d17d0b09541 SHA-1: 5b62b78ea194e6dcab6b2b7586a0a0b8ac28d58d SHA-256: 0d96f555e96fdd5180e8987bb49dd99a85237b9b612af03505205b9575495197
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. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS uploads. This suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://gramercy-grand.ru/files/file/fapexusalekova.pdf In PDF document text
    • http://brezov-gaj.si/uporabnik/file/69376311731.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/p144oq5o9rbagm0bm7v52tab36/rubokufi.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/saweri.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/24396447027.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/b3s4ks5o1tl93hb2oqnuh93po1/3724470487.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/derep.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e6e80397---54303187879.pdfIn PDF document text
    • http://gyorszol.hu/userfiles/file/dasalel.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/30885830052.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/1a4856214232d2e26bc6b3e9cea4e354/24775459367.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///65564741386.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/kvcph7fu591j6qgn1etjk5ct3l/zabevefes.pdfIn PDF document text
    • https://12shio3.com/contents//files/nekapekogufokiligilanaf.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/7o26ip5f2gftibu46lrn63sblf/76420635937.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/54882604019.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/b8e4fcb834296f0a6693ec5a9a76c097/likeno.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/naxebi.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/0p8h6q9u3v3jfgi79f9rgkm785/50377762931.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3543ccb379---zidabovadoxose.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/ribetupox.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/5c431a2f110531420c9ae20c89bae72d/dexiz.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e928dc8b---78841797436.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee74327c986---6982782865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=changing+time+zone+on+sharp+atomic+clockPDF 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_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 16548 bytes
SHA-256: 5a47cb6823a37c7f4376dc01cd126c5f0aabe06023bca29100bfc0715bddb17b
font_01_sfnt_off00011b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B98 11004 bytes
SHA-256: f044e3fe02e064a9058e6448ffafc3b061e5ae180bbb05a98b3cc86e19dbce60
font_02_sfnt_off0001350b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1