Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d0e3cd3e86e49e9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 10:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb205f3a029ad579b09f8f0a92b22f58 SHA-1: 41a205e5e196899c08c31631776aa1f2feecdd61 SHA-256: 6d0e3cd3e86e49e9926db7a7e7f875cc245b0aaa9d3818c1fe22474bacccdd41
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 ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, likely serving as a distribution point for further malicious content. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially leverage SEO for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f010ca5b7a---gavulabitaxatalibijuvowif.pdf In PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807b1116bb3---71278052566.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/fogakebujal.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/29834678786.pdfIn PDF document text
    • https://sce.tw/uploads/files/60cb02ddbdbdc.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/58480365583.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a0b77c16d---jutafofusofij.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/j0ksra6a7ba8qak1e2uh221n61/41985733784.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/wepanekaraxijuxiwuzeb.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bfbe893fa---24182503255.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/48969542139.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/796e7716944773c8d665e6fc4d5c8abc/jononisikulibemirarozi.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210903043245.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/xilififixudunakemisax.pdfIn PDF document text
    • https://hsse.cl/files/gifidorito.pdfIn PDF document text
    • http://mousike.it/img_ins/files/pogapisamaluw.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/558e3e848789975ee1f15a2e437787d7/jotaponexum.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/97717335226.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114b11c2e290---17433298083.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/kost18vkp3noe1t58bgff43l11/murolusulufexoxisobo.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/vaxizumuvufixonuvid.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/50276014391.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607072d09c458---xuvuvolamapoxumeso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=open+worksheet+vbaPDF 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_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BF 10620 bytes
SHA-256: 0fc9c8659504c968ce4d7339d93adfce67778c6e4703d4cd414e6d6b6547560a
font_02_sfnt_off000110e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E2 16756 bytes
SHA-256: 55530d9509f8221db43a4da8af57d555076def4dd574148490162ccfc68437ad

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