Malicious PDF — malware analysis report

Static analysis result for SHA-256 52040808aac1d1ab…

MALICIOUS

PDF

94.0 KB Created: 2021-08-11 18:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 747ef6f823d3aa7b52713e45d6203799 SHA-1: b2cbfe1066cb3339fa4849d64cc3ad9534bcba5a SHA-256: 52040808aac1d1ab2ca7b18c15d632bd289d562ffe1117bc2b8aeaa9ea1f5b61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the nature of the link farm indicate a likely phishing or malware distribution vector.

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://rubenferro.com/userfiles/file/83542788733.pdf In PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869f552df88---moxoxovazumazepamasaba.pdfIn PDF document text
    • https://lasanisports.com/files/mazuzo.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/perudafat.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083a55f91db1---wasebumufemafoxularafik.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/juwamekibisawipekipewogeg.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/4c9d0d4c9ff474075072746a34f52e43/97707896734.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/63a62f598308f4a5567d922efa343866/wabinepigajenisukovuvi.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b10da6b6c02---sabogajukilip.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160add396e9aa1---5122325172.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/gonotike.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/nunirefitod.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/lutiwizede.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e850d6fc7---36871028655.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/26072227755.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad403355d---kejuf.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/81050118048.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/kasute.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082618de2f38---xogasetakasududajitubovo.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/kaxubujigibetazib.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/sakinajukowamiv.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/21b435e8582727b698ed76e3babd4908/33926713506.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/vafegetuveso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dr+driving+2+hile+apk+day%C4%B1+indir+uptodownPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/pijuguxukutok.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_off000107da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF1 11128 bytes
SHA-256: b4dbfe5e8c12f4a96896fd6a7b2a1826fffca5ba770033bcbebf1aefa760689f
font_02_sfnt_off000139a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A8 18224 bytes
SHA-256: d9e421e1ffc34f61e909679d0e9ad4206537d12102e5cc62d03b7bcdd3794fce

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