Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac07e7d5c2297ea…

MALICIOUS

PDF

110.1 KB Created: 2021-09-06 18:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d21541f636ad71021588ced62b630b36 SHA-1: 846a34d5c92ba6c0b737171eefd27656ecf8fb24 SHA-256: fac07e7d5c2297ea7a7bdeff536df1052d06da09f6bee33c51b3293e550b517a
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 compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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 http://imssp.by/data/images/fxeditor/file/radevolutanuwex.pdf In PDF document text
    • https://harmony-lazienka.pl/Upload/file/45880131723.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135164da5e88---12980721054.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/82381718645.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160df50b536369---folemonalasoni.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210530203410219976886.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/87690338067.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/10008927219.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/tudus.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/gixuvoxapivosikuwo.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/44683564056.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/weredubonetulopireronagem.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160737ffc9da1d---xetenujulu.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6000bc5e3---razixenafasumus.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/76876331043.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/1047573450.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adb9ebb1082---kuroxilofuropilovarawu.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e35de9e6e9---vosifuzixonuw.pdfIn PDF document text
    • http://splogservice.ru/content/file/76679621756.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/tudofbd5jdeolqi28c5mbkuim6/30730912732.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad04feb5c60---64984312153.pdfIn PDF document text
    • https://emprenderem.cl/files/20163791780.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/7635234661.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/mqj04ku5dt9vc3dumj0te2toh1/61469387792.pdfIn PDF document text
    • http://stringpoets.com/userfiles/file/73124355111.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/ravoni.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/fcc1a222c958d3248fa494cbfe08c0e2/tozotigodifude.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a1a346b10---lizolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=nikon+d5000+owners+manualPDF 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_off00014a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16292 17964 bytes
SHA-256: c5c03e1cde2ea8b50c3fe17398761a24108467996946a688c41de42ac5c9e6ca
font_02_sfnt_off00019100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19100 10824 bytes
SHA-256: 296c30d26fdd20a659c03efca30989fbe3b9258e897490f1f713e9ca156ef264