Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18189d00db03e33…

MALICIOUS

PDF

86.4 KB Created: 2021-06-28 01:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0bdfcd25434365ffced1fedc2cc4542 SHA-1: 06d8dba9de8b172e1193bf0da3260d68580d3b10 SHA-256: a18189d00db03e33c1b3d1d3f7380e8fa7b2490011f4b46b20facb61ecaf71b5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted from this sample, but the presence of external links indicates a likely intent to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/samuparewimopizan.pdf
    • https://associazionedynamica.it/uploads/file/gumem.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dafb69f1d---vigekigafu.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8eb2421737---25588825172.pdf
    • http://cc-loges.com/uploads/file/vometubazakotupedi.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51d77205e---17847268039.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d36489358d---degonunitada.pdf
    • http://brickchamber.com/ckfinder/userfiles/files/mizalede.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/6a462825493f2ac8a7b89d934c5ce2ca/49605013694.pdf
    • http://mhinflatable.com/upload/file/mobaranavi.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/688b3f818e751b945bf28ea36b61ddda/54674796620.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/kavebowivatopefutufuti.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/abrk2027hbnvnjolipmh580pdl/bikepedivefudunibimitut.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857da899dd6---35360339775.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607242f5bcbdb---faduxiva.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/f4jvk1a8j2e0kgeib4v2n76a3q/kabixutaganolufak.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/1eu8it7lucol0gkte9d5c18u77/5209944491.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c57f4398d47---9907485274.pdf
    • https://clickkedai.com/userfiles/file/4112248376.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ecea50360---fejab.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/658a752cb8b505cebfefdbe73a386cf0/15971970483.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+you+gonna+do+when+the+chips+are+down
    • 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_off0000ea00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA00 16792 bytes
font_01_sfnt_off00010212.bin
05cbbeeba4bc01e603738ae8820ace599d5d6b88823ef16f45420031eac2bbb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 18780 bytes
font_02_sfnt_off000132ae.bin
c261431ff0d153144213c4c2d990271e7db85367c39e8a291d6091f3e4966a53
pdf-font-stream PDF embedded font (sfnt) at offset 0x132AE 11040 bytes