Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5de6cd4b58e403…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 05:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 45e4c65ba80fe820666bf2279f83cb57 SHA-1: 9948d64213db4545ccfccdadd072ac3d9c77fa36 SHA-256: 5d5de6cd4b58e40321daf8d28ae30a7112d0d72791634d0e78f83847bc463c39
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and is flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm and a callback phishing lure, attempting to trick users into calling a phone number. While no scripts were directly extracted, the presence of numerous external links suggests a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://allytemp.ru/uplcv?utm_term=how+to+access+system+memory+on+android PDF link annotation
    • https://skl.deindrukdemo.nl/upload/files/92514230045.pdfIn PDF document text
    • https://aromamarketing.md/img/files/wewos.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/68926406235.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/pevoso.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d19fec47ef---zugof.pdfIn PDF document text
    • https://csn-alliance.com/data/files/64266369203.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/70344122161.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/rakitilokabikin.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/murovujunobevemaditigin.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/19985386218.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/jufadexokov.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/21967057034.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39481812872.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/f9sue0ilt4ilnaat4lv1gv2ul1/suzowege.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7e3cd04b7---86756581279.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/1071761016.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///72432745070.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/jigomegurogesavomevameran.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/63665974496.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/jatizezimusowogu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae46743dcd---dunusas.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/15903832834.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8ba341357---kutitifirefoxobotus.pdfIn PDF document text
    • http://topflexsports.com/uploads/tajubokakun.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/wifetajoxukolowevubit.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_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 10676 bytes
SHA-256: d2a17f2b47febcd60b6e6214e6ea9b504f3b3dcfd6d4b7e0d5f32d33d623ea55
font_01_sfnt_off0000f677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 19064 bytes
SHA-256: 4e0ea6c592262ea2cd65c40d7b4c21cdf1d8894b56ccfb2fa0a0748731dba365
font_02_sfnt_off00012823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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