Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33f6ec0b32aa257…

MALICIOUS

PDF

89.6 KB Created: 2021-07-04 23:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c5772143554cb6aa7fcfd4bf0b9c9385 SHA-1: 71e2b4719a67158bc844cce73052128268c0ecab SHA-256: d33f6ec0b32aa257c6483dda3cb6f9cb161f4de11cca00a7b6af83e4408fe5ca
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document functioning as a link farm, directing users to potentially compromised websites or IP addresses. The presence of multiple external URIs, including one pointing to a raw IP address, suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://157.230.241.115/image/upload/File/bofolez.pdf PDF link annotation
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/c2d344dfa92a3d39e50446387e321649/kumemudokag.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/nawipuf.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fad712e8ef---53472028532.pdfIn PDF document text
    • https://actor-conseil.com/files/file/fetugef.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/4004c22b004cd93abec28dd39d300343/rofeniwomunapewux.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/39877915254.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bef40f06a---71746657520.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/42087664459.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/63754106043.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/zogeripilisigagufulesaje.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/zomoj.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a5878ca580e---pesisonobipoju.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/tojevegukiw.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/94583582233.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/72243768673.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f43f1cfb3---rametidotaponuris.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a232351d926---61082462273.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070be19d91c9---41769807097.pdfIn PDF document text
    • http://sns.hu/_user/file/ruwuvuwutodivawugekan.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608313652d1f9---wamixefabukivavufa.pdfIn PDF document text
    • http://candientushinko.com/images/file/101476297.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd16496b389---56358103855.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/weludonogigi.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fed4a729bd---rumex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=aztec+facts+for+kidsPDF link annotation
    • 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_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 10452 bytes
SHA-256: 0a3dcb71168fee1210b04801799491739cee37048d038fc9f6aee7f5e8fe48db
font_01_sfnt_off00011326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B38 17804 bytes
SHA-256: f0b8bae5fa6b3ceae28f11e001d6d6482bf5236ee57e69fe43f1b9148fed30f7

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