Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e34bcd5e6585ea…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 08:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 36da0078b734a96677b2c81511c8135d SHA-1: 119e4269b68dc662572ca2de25927c65ccb4dcc3 SHA-256: d7e34bcd5e6585ea4ec41631f0e7a0aec67cf163295345f312372e0878f809c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms or compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution lure.

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 https://laborke.ru/uplcv?utm_term=waze+freezes+android+auto PDF link annotation
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631484816.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161439056dff1b---81403906092.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/zalozexuzemepemunaxax.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/kefetevidif.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/31260216893.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/ruvizi.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613059e327284---60794890427.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141c4293bbe6---9331767559.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/rebojetubetunitidomajexa.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/73167846228.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/63144928544.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/27314427495.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/d531ea95f98da459c1c77216eebedb34/74290080369.pdfIn PDF document text
    • http://retrofitoman.com/ckfinder/userfiles/files/nafojajamilusiw.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/23479435816.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/84979888062.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/mibijojelevudeku.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142dc7d0d2f3---66407152237.pdfIn PDF document text
    • http://aurora-c.jp/files/files/79662325362.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141b8e49c1fc---sojowe.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161412985a6e64---fidinonagaditameker.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/77669558783.pdfIn PDF document text
    • https://teamcode.net/upload/files/xakeparevemuwu.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_off0000d0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D1 10452 bytes
SHA-256: 850294b5935f257730cfda78742d369f977f6ff9b64888dea7d304028571fcf9
font_01_sfnt_off0000e8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 17892 bytes
SHA-256: 00058df67562089d90525428ffae6c18eb48ccdd7f497708bd7e8b87c7e10684
font_02_sfnt_off0001175c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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