Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1816b4270ecff88…

MALICIOUS

PDF

95.1 KB Created: 2021-09-10 02:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d611e2ced50b382482d49eabbb088180 SHA-1: faadbbae966b9d8a33a9341db95b70ae636cbd31 SHA-256: b1816b4270ecff8898444c413b8873e6c96ed480dfcf99d9ff3d59f2b52025d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of a link farm on potentially compromised WordPress uploads suggests an attempt to host and distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://huntic.ru/uplcv?utm_term=block+man+go+mod+apk+2020 PDF link annotation
    • http://wjcopy.com/upload/files/4058189389.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/mepineletidugawunesef.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/43268381525.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/zibebizawo.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/3900935994.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/72165821356.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/19a9db2690447125a5fb89179e4919c9/142725085.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/80369019246.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/clk5h805nqbq5ds89mt0t96s56/42424218575.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/mogowukoturep.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/622ddede834403986e4e0becce6b46dc/5381262918.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/59315663563.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/22545057748.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/lijatumazolexesig.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/21774433041.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a79383251d---lusunivukajabexidiwunivep.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210902092356.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16139c2d2b14ac---sorozazupeduwomefuso.pdfIn PDF document text
    • http://salwex.hu/file/befine.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/wakufixajowikuvorenatif.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/60227377881.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/binimedonazulenega.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392476dd697---julajowobogunozarozej.pdfIn PDF document text
    • https://anandalaya.in/resources/file/pufajabeno.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a927e25526---96102774610.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/68117019326.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_off0001107d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107D 10652 bytes
SHA-256: c0db3c3d5bdd53c9c1172b8d983b7ca101016d335cb81c8ac15226acebfd47a1
font_01_sfnt_off000128ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140BF 17324 bytes
SHA-256: cf4ab7f0614c369e42f75dc0768ac70197b3cd58bc9211c994a8ab7cc1db57ab