Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0c88df9c475f06…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 16:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 436a08e86d9c00ecb9266f58f093933e SHA-1: fc19e100364e77d8aa7bddcdbad384d0e608fd73 SHA-256: 8b0c88df9c475f0627a96cc346347bfbcbab86d577cd417a4589a1f4cce63b26
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://medvor.ru/uplcv?utm_term=recuerdame+coco+partitura+piano+pdf+gratis PDF link annotation
    • http://w-mill.jp/images/file/24951705060.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/1065de0af3839e3d1cf577c9adcc7065/20395133524.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/73353e07f13b36e448f9596030c9f97d/borix.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/ziwosozabezamuw.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/nrql8gfpqcmr05k2esm3h5b6e5/28120624153.pdfIn PDF document text
    • https://medtek.vn/storage/file/zedobemewamusubu.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc1125273c---79361823019.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/fegedilawopu.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/xonopegavomikupawara.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/6f9b73c8a1757152b8349a69b9d70d15/zakuxalisozifowoxajesoto.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/mojozexobadulukisireko.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/12936116006.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/oprmvt3oh2oj8jpm02i0bmmut6/67439096414.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/65367719535.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/93fd67f6a713c4337350299962983de4/gifurutorizeb.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/a21293cebd3af35ee9459a9d6f6da226/gevivezani.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/vakutiweronotumajojobuwor.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/26287829480.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e04b4b6eb---23133945854.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceb2ec8ee7---diboxoju.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/sazanazapusisomezozogituz.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83bf7bda6---movilapi.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_off0000cd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9F 18620 bytes
SHA-256: ce31a89376b0da745c2d2b29ad518a26a0f4a5862576be3b1ee9870e14401f9e
font_01_sfnt_off0000fecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 11064 bytes
SHA-256: 72457497a49f2429ae2c063c31362876f6e54be97050dbddeef95614252d2900
font_02_sfnt_off00011864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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