Malicious PDF — malware analysis report

Static analysis result for SHA-256 106ba3e5b58ce104…

MALICIOUS

PDF

71.2 KB Created: 2021-09-06 15:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c6f39bd027ab51aca55b74e64292d880 SHA-1: be582094eb0c933855d8529c8114b57343576b9e SHA-256: 106ba3e5b58ce1047168830fc4aade083676a1b926057c79e731b13cec99c58a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be hosted on compromised or disposable infrastructure. The primary purpose seems to be directing users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://happysmilecard.com/uploads/files/38250974014.pdf In PDF document text
    • http://mishelik.ru/userfiles/file/valiguzulazotasusepuzus.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d07880b27703a324267a7f42d560d59/80667747189.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/68680227723.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/31788881101.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/49c01a232660d092c532413cb136a6f8/tiwixitisufigumupenikaw.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e655e81e3e1---nakowuriwaleniruz.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/70512010544.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/0k5f8pfp0tnq25s1ufcv7bc3op/2746634108.pdfIn PDF document text
    • https://emmaushuis.org/pages/52982483385.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/53930094249.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/89585699448.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/2784999cfba13e75d0505c8fac01dfa9/52910540721.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/gesozolupigekumizoz.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/xowopixuj.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/b4de96da0d7563c0182b6b4bdbd90a6c/tovubajelepaxerexewogo.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/wutanuluwirarakudin.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/90982930940.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/44509522327.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e040d98ce---fufunitivusujibiso.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082deed78413---sarugunoxoguwunadepiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=manualidades+con+material+reciclado+por+el+dia+de+la+madrePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EC 10768 bytes
SHA-256: 7d707467a7be2c15afe21e7cae480ecc2b172d3e9d5f8f7f03a58ca997b366e6
font_01_sfnt_off0000ce9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 15476 bytes
SHA-256: d7f35a774eb97e16c54f6f763444a73ce41c3b2772033a969ee60bdea7572c8a

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