Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b61c48015a69e8…

MALICIOUS

PDF

84.7 KB Created: 2021-09-04 10:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5370db9321baf9669e7ebbdd9915b8c7 SHA-1: 6d7439731b9af0d5c00fad90cbb72872fb27f108 SHA-256: 70b61c48015a69e85e1cc0a70ae7c98351b086ce9dbaf523ded85c72c9cdb79c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://nikosdimos.gr/userfiles/file/63053129170.pdf In PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/4f9ogsrr37mcqfle7ca8cd1cpj/pureziregadezok.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/44417915999.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/98885893451.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/segevoxikefeloj.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/43283353072.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/40861155401.pdfIn PDF document text
    • https://whitesal.com/data/images/file/8146_20210803114413.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/21077550776.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c72d0aae2---mapebusivurenotonuxix.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/71817899852.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/cd996fb63e0871dc8195a4302d7c6a31/tidamed.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/81c1cf7dc0026831f60720b7e2026d18/vonib.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/tadutenik.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/wazebogabegesipulujagun.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/8ein2gp5jt66lk14rj0nf4mbk8/79916635388.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/d89593e42cc6c89f14662762c196a324/nirewowuru.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/eaf6su0t1cer4eg5cnf91bbqf9/luwozinalobogotavazadifo.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/pumifovijogekimitinegemit.pdfIn PDF document text
    • https://thepainter.asia/upload/files/jatalariwiludasita.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/59380507703.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/molabilijefoxuxutototo.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/jt34t2o5vg9231cltljfbid4k5/madesufilotekidepenojimow.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a92929c89---31940470011.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021062718580633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=nptel+directional+control+valve+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 10488 bytes
SHA-256: 589b18b48b6c2fc612344c669e95ccfb52b6d351378eb6935aeb5ae13f189553
font_01_sfnt_off00010279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 16344 bytes
SHA-256: 8545bcb9ec4a35e3860257a9d277ac5d4f0b61e7d08d4cfd8ea5c0ef65e7cddc
font_02_sfnt_off00012c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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