Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c1999c661ad431…

MALICIOUS

PDF

76.6 KB Created: 2021-09-04 18:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4da50fc44106cf7d34ecfdabf3628197 SHA-1: 420fda3936fd3db9655b42db1c37f56ff286d14f SHA-256: 80c1999c661ad4318a93d10b7a929ad225b29e691979544f4f17cf804a6602db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used to distribute further malicious content or phish users. The PDF structure itself, while not containing readable text, is indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://philabc.ru/uplcv?utm_term=upload+pdf+file+ionic+2 PDF link annotation
    • http://jdhs77.com/clients/58520/File/porojebunonetobomo.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161167dc5723bb---nubupobiribazivusisakege.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91035673642.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/lazemori.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ace4cdb54b45d7f4548f91659527435e/12318870626.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/motode.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/nekamomirudabinafo.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/mojejalemejo.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/g87sj6eh7vu2op96fr4jf0b4e1/10748864829.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/9882057718.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/58800564946.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b9fb008b9f---53514506899.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c8b27f80c3f65ec4df3fc11059b83140/pamilinug.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/funofiluf.pdfIn PDF document text
    • http://beta-rc.com/upload/files/16877884711.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/89603330812.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a7274fd6f---72019363514.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/0d2fb09785c9810937db3469efd7ea1f/zijesojipi.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/wusimo.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92107d6c52---57176684488.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/51372312947.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16095fefbd72b9---29307426143.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/bomenetatajulugigi.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_off0000c5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BA 10376 bytes
SHA-256: a577f2c0b485d95004a4910826cd0d864b2e179275a67a28e3680b19d3f21c8b
font_01_sfnt_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 17896 bytes
SHA-256: c28d78551ab9997d648bcabf666f615a8da61f59e4ee26a411b89beeb21086ab