Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5d4f3ddb847e04…

MALICIOUS

PDF

96.7 KB Created: 2021-09-07 18:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36951afd45f142621421acf4241dcc3d SHA-1: b4958b24a39bc4c6d33fcd45a67713a83abc1789 SHA-256: 0a5d4f3ddb847e04bfdd8e5df5ad6039b20f077f1b03992c39de9e63bf6f8d0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://elger.cz/fckphotos/file/povepudazinajenef.pdf
    • https://meesens.be/KrMee/Tekstverwerker/54097387696.pdf
    • https://kalashad.com/userfiles/file/vipizebewurinax.pdf
    • http://china-zub.ru/userfiles/file/65952471906.pdf
    • http://myagreement.com/UserFiles/file/nedujakijiwedaxun.pdf
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/pezujidunuzowasixakogis.pdf
    • http://mazraeir.com/images/upload/files/21885877242.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc3c8100f3---piwilexuselesa.pdf
    • https://baigiangtoanhoc.com/upload/files/lokawufirijuxikini.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608942597e01f---gujodu.pdf
    • http://abnicum.com/files/file/saderedonuzuzafew.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c4cb344be---66131827120.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f360df18b9---50158423648.pdf
    • https://communeouchamps.fr/userfiles/file/25907572277.pdf
    • http://xboxheerlen.nl/userfiles/file/tavijatiwozupukakewakumu.pdf
    • https://dnsbp.com/all4help/fckuserfiles/file/93712235627.pdf
    • https://ropaalmayoreo.com/images/userfiles/file/77651603934.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/s7q5vapn1arve2ufja58pnaua3/xozukowanobukatazawuzulag.pdf
    • http://allaboutdowney.com/userimages/43086337251.pdf
    • http://bmfjhjk.friend-match.com/upload/files/vumiderofefekijujes.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160fcaee08aa26---96302447637.pdf
    • http://sinoorchids.com/image/file/pikibano.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=javafx+api+documentation+download+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001153a.bin
5178193cb91532b4d94e518037190840eb5f31894a3dd7df8c021699849552f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1153A 10856 bytes
font_01_sfnt_off00012e56.bin
7fe21baa5be92f89823c9e106f272d1495de346ae4c9093e634477163a1c9677
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E56 17648 bytes
font_02_sfnt_off00015c85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C85 16792 bytes