Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0787ffffa797fc8…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 23:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7f371a65caefb12a609ce4c65c5d5282 SHA-1: 24f97e09c87bbea087dccfeeb3dd8a1f44a698b5 SHA-256: b0787ffffa797fc82171fd7bdd7561502de8ff55572feb84dbe3143f3af78710
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this, indicating the PDF's primary function is to host these malicious links. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://irlanc.ru/uplcv?utm_term=best+android+mahjong PDF link annotation
    • http://nenayu.com/filespath/files/20210913172502.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/ae926d184a2c32f458bd073e764dc7bd/xilafesi.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/66742298770.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/15059268525.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/98519145549.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/25818423234.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/dejetosaruf.pdfIn PDF document text
    • https://seger.cz/userfiles/file/88426681453.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/wibujuwezoguxekelukaza.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/nolobagunusud.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/rukibudobur.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614013f6ac0f8---54019955557.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/79033685518.pdfIn PDF document text
    • http://zenithmetals.com/files/72407355077.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-08-17-49-34-10.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/36162761035.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/sovegepozimoreletejeg.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/kikuw.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/lepuraxamodib.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/zekalozejifagopuvuzal.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/83042349057.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141e41e3efa5---67624885395.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/livuxifi.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/16944530619.pdfIn PDF document text
    • 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_off0000e7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FE 17496 bytes
SHA-256: 641b3112b965b6f068f09e74f074d73a246b1d218fa85ff9e3544d745698dec1
font_01_sfnt_off000114fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D13 10832 bytes
SHA-256: 3763adc32967448dd3d1dbb88f1d3ccb71c4a4ea03724b6289a4a2903baabf7b

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