Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2abdcb5ccc8481d…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 06:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ae5fdc1b6d459018a96ad468958db4b SHA-1: f560217b47fc1a5e96ff8a1c473280f75a490c04 SHA-256: a2abdcb5ccc8481d0b3d3cde2c24879ce186aae25fa449bf4ed6c54ecec5b4f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=android+phone+not+recognized+by+mac PDF link annotation
    • http://freeorden.com/media/file/48338651006.pdfIn PDF document text
    • https://tl-systems.hu/files/files/8697655213.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/dolegelepiritefonaza.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/40945224108.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/tufagore.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/27555478184.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613554000ed06---buronif.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109100431193358.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/15396310324.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/butikegudididozomavod.pdfIn PDF document text
    • http://salonrowerowy.com/userfiles/file/vekanumofa.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141383940a3e---89198306624.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/ditivasiluvezopamisivafag.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/javobiminawik.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/pavufibotuxexesiv.pdfIn PDF document text
    • https://masihpt1.com/contents/files/gipog.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/16012893942.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/64059703761.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba58e21d88---94758425817.pdfIn PDF document text
    • https://mmtours.si/uploads/52597860554.pdfIn PDF document text
    • https://acatay.daynexdemo.tk/upload/ckfinder/files/71137918442.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392a7d63278---labodoxikitopagegoropisig.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/tuxemivovezojoxabet.pdfIn PDF document text
    • https://parc-hotel.info/file/21983141920.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_off0000b16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97C 14332 bytes
SHA-256: 21860646d203faf369963341c178eaabd3870626cecf1389a061832c7bd25bc8
font_02_sfnt_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 11040 bytes
SHA-256: 0552050adbb007f7948d675f64a736cadd0720adbfb0e95d5ce14af540a2c8c8

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