Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5af4bc035c0d94e…

MALICIOUS

PDF

71.7 KB Created: 2021-09-26 17:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b78eb4de57878689a5e1b8b6614481b7 SHA-1: f3798e8e60800378561c5d91b8890ebf379d008f SHA-256: a5af4bc035c0d94e0bc85b707bcb12f628fffdbb78524b2aad807bd44bfead6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external links, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://chcial.ru/uplcv?utm_term=portal+mario+64+download PDF link annotation
    • http://voyagevietnamlaos.com/hinhanh/file/93694964553.pdfIn PDF document text
    • http://www.ezmoving.com/file/49347286580.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/75493272423.pdfIn PDF document text
    • https://clubon.top/uploads/files/neroluwut.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/modiwofisuwugurukojas.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/seziwowigudujisaso.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/91497817373.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/vedumufu.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/lulasetibawijirizewufilo.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/42971855873.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210926_91D0432C58B190DC.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614f0b92145ed---61065345699.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/bebezuzuwake.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/61653099127.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/situsun.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/6522a585e248848c44779765699d67e2/54386407766.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/zekewitataba.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/39784636297.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/vewatufeso.pdfIn PDF document text
    • http://delve-cr.com/uploads/15299614914.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/pavatijexirilu.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/53726606792.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e469acf8e1---xuzudageku.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/69d1ffdb4fe6a25b63166abee8a110cb/jalazakujetemuzonazo.pdfIn PDF document text
    • http://buddhavihara.net/userfiles/file/58778704358.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed7400690c---63636971117.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/polapebalopiguwut.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/98494886872.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_off0000b74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5F 16336 bytes
SHA-256: be1385af937173ae2c3236b7f6e046ed55b2f26ded24cd164c61d4b9c262203c
font_02_sfnt_off0000f8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 10440 bytes
SHA-256: 6a8813f9362bc29f6eab3a5dc3a2a4ac99e79d9606bc35dad5c396bc6fbe60ba

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