Malicious PDF — malware analysis report

Static analysis result for SHA-256 373d6c001442b3ce…

MALICIOUS

PDF

73.1 KB Created: 2021-09-03 19:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 49c0105ea51f5e06e15db53267f36eec SHA-1: 8eee6c422fb1283f1ad67c518e5ef360e9f1aced SHA-256: 373d6c001442b3ce01b6493a5ba7ba3dd0d4e1577a107192860b3b49d142116f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=bioassay+of+heparin+pdf PDF link annotation
    • https://accesoriosalmayor.com/images/userfiles/file/papobulowafitetibukidax.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fbaf54ff6ff4ec027d35b02758713371/fojoxedadesapumemig.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/ledopa.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/20647537385.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/97mil564it9sfvnud79c7emai6/gunepizopuwi.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/jorok.pdfIn PDF document text
    • https://arerp.kr/data/file///54206925969.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/2te0u0c9n2r4vvsqj2cl0ou2r5/xalum.pdfIn PDF document text
    • http://screen.by/images/file/43725669620.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f36dc05244---nomilopuduzil.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/16473232657.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/mamon.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/dipezuwetefedovuxetano.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45572640626.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/36097759454.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/nifemujurodobesad.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/5002910237.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/61083966956.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/58bacadd7ca071adaa9ff62e32e9df29/zulimiduwibogeloruk.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acc6ed77571---tominanoto.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/juwajonawedakeni.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/734ca796adb6df7d02c14d91ced901b6/natesalekogasulofato.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7442beaf08---poladubisupe.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/sivuzi.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/momefenedosikatalorume.pdfIn PDF document text
    • 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_off0000ba47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA47 17344 bytes
SHA-256: 17443677365cd732a366af67d2bf8d9620845d90ca814fab9a99e533956b51c7
font_01_sfnt_off0000e6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A5 10616 bytes
SHA-256: 9679810a2dd14d17bc3bd00ba5f45c7b843e2556df7cc47a088595952f4cab2a
font_02_sfnt_off0000fee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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