Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eff3343b3bd906d…

MALICIOUS

PDF

105.7 KB Created: 2021-07-02 14:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 19a312808ade547eff8d909fb34589aa SHA-1: b9d5d7e3fd51b64a5540c9a4778268096be036ff SHA-256: 3eff3343b3bd906d0c54fdf3609ee3b9b696d6ad48446ed01a2a4c6db251abdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9308

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://synerhu.ru/uplcv?utm_term=bagpipes+flowers+of+the+forest PDF link annotation
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073d76c946d7---73158972112.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/14b01d941ffd65ee4be0db9d375c4a42/16717479606.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/77215636289.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/58706264686.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/gofirurejupodozad.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076899e96d92---jajurujevofotavupo.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/360a158665ed1f712c3dac2dbae0147d/38807116081.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd57237fdd---watajozi.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8mjl30g77lmmdf4v6o8o65adt7/lonesukozu.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/beb393d395438ca24551056f86cf8ab7/40748209345.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/guribadozez.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/5cjrku23kfma26qj5qu45piipn/vigawojizodunaz.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/011mos7lfsugf3km2jrta1nil1/foxaxuxu.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/49979364488.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/52993670761.pdfIn PDF document text
    • https://koratspring.com/upload/file/dimozirajeneledazabe.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba33b7e9c8---purupu.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b95041167e---vesusamosigiz.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/25680669442.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607add5503823---sexagiburivixepukob.pdfIn PDF document text
    • http://yoron.net/up/files/felutatorefa.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9b3f9c961---50361005407.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/1fde79c09623c4f90f8c570beff7f133/53859536134.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e33551c3---79819423629.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/bajuravuzokir.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/fagufureli.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 10672 bytes
SHA-256: d59fdf313e00be955067d7b2f3b3f71b7ce007994dc44ddd4115f52e819e149d
font_01_sfnt_off0001188e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188E 3032 bytes
SHA-256: 90601e82fce2e26ec1ad8f50b1c1c507b81fed03b03124f52ea107634208037d
font_02_sfnt_off0001250e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250E 22660 bytes
SHA-256: 72c59abf6771c3ccf85e7ef705539a71247b398a4ba6377ba925012236b2d9e9
font_03_sfnt_off00016143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16143 18204 bytes
SHA-256: f1b9507987a2d7c76869196656c58443ecdc60457012e112c5823db29732c97f
font_04_sfnt_off00017e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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