Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58d215ba87f8464…

MALICIOUS

PDF

85.5 KB Created: 2021-09-16 20:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f0abfbab4f82b816df03d48239cb42e3 SHA-1: ae6dd8cd0f636042c12b61449f7ba7c31380b3f7 SHA-256: a58d215ba87f8464e137b2dd1aa9139db7601d7ddde484d4f8206bf988b34da4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF 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, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=fear+the+walking+dead+season+3+episode+11 PDF link annotation
    • http://www.medic-pneumolog.ro/fisiere/file/fakokadusuvexajo.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/gunoliduvovefojidun.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/98639691271.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/10b31e20bb8de3f236d8ec7aef9a20e5/rusex.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/25312634435.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/99907870989.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/poxukekovijunikaj.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b16d476fa0---76010198121.pdfIn PDF document text
    • https://petala.gr/userfiles/file/21420520926.pdfIn PDF document text
    • http://rcmo.ru/upload/files/tozoxemoso.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/niwufinirekeb.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/50119867978.pdfIn PDF document text
    • https://businesslife.com/content/file/turazipax.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/6060048971.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/72241384952.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/9b2be434b85cb8d83f31ef09205fa686/wixoguwepigenogonurazo.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/55204485856.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/2999080069.pdfIn PDF document text
    • https://hotelcorona.ro/files/74076130244.pdfIn PDF document text
    • https://duvanco.be/docs/files/sijexejuzivabe.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/xanajinakumoranajegadulu.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091008100726193.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/selokuwewaxiled.pdfIn PDF document text
    • http://vladekoservis.ru/files/laviraroziligoli.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/tirovugomokubagofibinu.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_off0000e6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D0 11052 bytes
SHA-256: bce7be3de46f7765524e8e8d1415e895e2b80d55d08bb76c8926516211a60a6c
font_01_sfnt_off0001005d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 18624 bytes
SHA-256: f280a57ef0f205dfe4bdf2bd850b6ea4c5e50c7c0f06c8df1de055055ed11de6
font_02_sfnt_off0001304c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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