Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d12868feed1fc4…

MALICIOUS

PDF

87.7 KB Created: 2021-07-04 04:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9d3125851fcd0bd3b9bbf5a402d5a47 SHA-1: 633d1ffbb55df6cfd35e7efc70d86c9cabef4734 SHA-256: 41d12868feed1fc4e944c5327f1823c644c5d725dbbe54961b62505e01b74390
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, many of which host other PDF files. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The primary function appears to be redirecting users to potentially malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/f9a196e247568fed74afe2c35248ab18/zarirolunaba.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6da91a1bbe---wobitaj.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/c8ca98a711d72ab2a57afafeee51cfea/jepow.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ju7nurqqq9pkf6v9jmgcqj1hi8/93882816813.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fff993bdc---76056511024.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb689843ba---jomumigebopazepimutumigag.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/53pca8fd5rb702amcmsin8ldsj/voxipomeba.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf71f75c6cb---miwukilif.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc442973475---jafuxumavonudoraf.pdf
    • https://aronabritcan.com/userfiles/file/kaxeribupuzokox.pdf
    • https://rosewoodcity.org/nbloom/fckuploads/file/87176285263.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/6471r4cb6p5kve5ls5tvgc0se7/42627785702.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f495382959---jutepuwitaselo.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/f5cdce3f6d8ac05d2ca3e2f439637849/55814256583.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aaa3d6e0d---vanotozuzadagosuvimobule.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070362f3fbee---16137843949.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ed52g7hb0tcdk3soqjns5j75t7/76871729156.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa8f355b11---90427356373.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd06078618---katibixawijezojej.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/543b4cf899b7ae06d310814714bc7180/fefinemerovulutu.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/nq2jos4qojtjcebbmn09k75n6n/wadijafeguxuwenapetozi.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608439bcd86a6---18542570853.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb03fb6cc9---jesolafiwaviwomofadas.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=full+form+of+rbc+in+blood
    • 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_off0000f464.bin
4821d667f0e16229e00262b31c8b79cac1899653d5f35bea3f7414450fb1e324
pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 10296 bytes
font_01_sfnt_off00010b69.bin
7fb0c9f757b28771fc403b6a3007d203a1193809108a1d99c55eee6ddf5eed85
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B69 17656 bytes
font_02_sfnt_off00013991.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13991 16792 bytes