Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a7cc129b3ed45f…

MALICIOUS

PDF

86.5 KB Created: 2021-08-25 16:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4cdbbe3fac47a8b38aeaa7f3ea28a290 SHA-1: b0a0c04eefa8242f6c1f230f2721e61b8954a958 SHA-256: e8a7cc129b3ed45f0aff2fa5b318d6643d41e148d1cf7c96a96614b0283635b8
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous embedded URLs, many hosted on potentially compromised sites, further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hostingalani.com/calisma2/files/uploads/wejijolilijakelelepimamuk.pdf In PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/76273918943.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/12647808550.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/41f383788752ac3ef74217efeb194e67/51980280690.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/rukabof.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/19094193101.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/pufijowoz.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/83567993018.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/ziwegobivuxas.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aea1c951b0---magakefewadifinababiro.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/xudezumazi.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/luxodewifoxofolajawopiw.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/76150775392.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/bdea27e215a1e6ce7ce82f607b85beb8/gijepunubidaponatutif.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/22c782c531ab7d4e6e26bc84f4e96de7/tosipadinerojolebapararal.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/witalizekegizotezizuj.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1404ecda9---61648875308.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16210280198603.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/ddfcd4c2bfad683266e2889fb6f3112f/pagapetigotizazexariw.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/8cda9c5572f77f06c61e60262539b2c7/lobenifozakeranomenigeku.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/fujojefonokifomulupotuxum.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3edbb5435---94764198640.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/60653694914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=no+guidance+chris+brown+mp3+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 18776 bytes
SHA-256: 3ded9aaca2ef9e6c6e95cee9882111b9cda0db582afcb602817e0619031ab472
font_02_sfnt_off000101ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BA 17992 bytes
SHA-256: 4ccd4d47f04eba841cd5032c5ba1833cee5b399ea3f397df293357e9d2fd7a67
font_03_sfnt_off00012f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F95 11336 bytes
SHA-256: e76465486e680acb912abdfd04f819619c2fdd972516ec0cdddc1b82798c58c8

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