Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3313e1e048edc3e…

MALICIOUS

PDF

73.8 KB Created: 2021-08-28 15:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd6ddba9c7583ea15a450158548b68cd SHA-1: 68aaf49b08afafc7636c3d28f254659e92c63f56 SHA-256: c3313e1e048edc3effaa118686da2c2f5fab9af25dab6b094a5636aab6133600
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using non-clustered links on disposable hosting, suggesting an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/nekarunulawesorap.pdf In PDF document text
    • http://guowangcable.com/d/files/95553621788.pdfIn PDF document text
    • http://ecologie-energie.com/userfiles/file/20728515314.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9669316db---gesasozosalemituburig.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4492fd0be05b80763287b632ecb521df/gonujosus.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/jorunufufa.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1323015859.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210817010257475402.pdfIn PDF document text
    • http://ashioke.com/images/library/File/rawejuwimezog.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/25942130955.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/97306026269.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/donitasobopegumabudepe.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/67314092628.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/88767961973.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/16ad40144d7354156d017002d782e079/69904817176.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/wozuxiv.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/wulowudaruzokabitazigisin.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/p8vg5pave5m8mteet1v5cpkni0/ruxibebemikeb.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/2058744277.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/t64q4bjv5892jtj6hmk77gc8sj/xilaxuvegenepafebiguze.pdfIn PDF document text
    • http://360mart.net/uploads/files/16797201592.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/xemonununisuguki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=teacher+resume+objective+statement+examplesPDF 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_off0000be88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69F 11140 bytes
SHA-256: 2c396a1faf2449838d7313d9075e6d9714bb59f0940a189ae3dec8a256b2157e
font_02_sfnt_off0000f042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF042 16616 bytes
SHA-256: 9688b48e0b35d40055b4e3a41b1e85034ed3936cf9d1a9b96897cb7a6ef51220

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