Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8d43348a13894c…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 21:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a08f0da5beb5420ec5f88fbd89714ded SHA-1: 4feb0477be6d91405010c18d17093d8523f090f9 SHA-256: 2b8d43348a13894c650d137ee4c227b0716a78ddb1d46752e9ce626b4881b230
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a variety of websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure suggests a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://catamma.ru/uplcv?utm_term=bubble+shooter+2002 PDF link annotation
    • https://ddshower.com/ckfinder/userfiles/files/rofig.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/pexiwemunotowimatog.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/susomuwuvevob.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/38599405411.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/mukuwexuja.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/60800624650.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/66515519188.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/23965998326.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/22830985697.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210903_9FBF3769BD04D8FC.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/xubodoko.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/mebowitavebe.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399559a7890---16847748489.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/didaxiripaz.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161309d1a72d32---walesuzukadulakojesilu.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/57384049786.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/28799078114.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/22306755790.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/28393391728.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/nituli.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/monevonosuvuzuf.pdfIn PDF document text
    • https://aedwea.com/upload/foto/57213519680.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14256895476.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327348188a7---detomedoribinif.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_off0000e2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F5 10384 bytes
SHA-256: cc8a760db6770f40e4809679d024f2db02f8c771c6ef94b9cedfc60e82decb72
font_01_sfnt_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 18656 bytes
SHA-256: f2be6a8bb9657587acf734decd3c37ac08caed4a9faabdd5a04345bba5f1d55b
font_02_sfnt_off00012bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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