Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3eda5cd085ec84…

MALICIOUS

PDF

164.4 KB Created: 2021-06-27 22:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 12c2d6e3e51944e8f7ece80d54fff8a9 SHA-1: 12fcd4609baa4d0c037ec114a6b8191d74cb3771 SHA-256: 4a3eda5cd085ec84dcfb4ec2d9d1fbc198b2846e335d469ae02eb755c208ae53
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or downloads. The presence of multiple distinct hosts and the use of UTM parameters further support a campaign-like distribution strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://archism.ru/uplcv?utm_term=non+violence+and+peace PDF link annotation
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/k5jpl79smnftjj0rbrif49s027/55080599216.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/4133112725.pdfIn PDF document text
    • http://armanetti.com/images/xiwuludujijiseketegen.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cad42b34cc5---71281411926.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2d1d1adbabcbf76c7557c07b454cffa1/49152399441.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/6fbe12da46ea6ed99e58d2b883dc5fa5/77327564786.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/6v6l2eami84nl9m163eoh41rb0/gatipix.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608200d3d84a3---vugalerasekakuluri.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/04b36a40400d79b7d47074d6324f0b39/80317785206.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/28998057612.pdfIn PDF document text
    • http://adveotec.com/img/file/63892779181.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/8267493307.pdfIn PDF document text
    • http://allycatering.com/userfiles/rewabapetelizuj.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/oi0ijhcac3208eqdpu9utv7824/93508718062.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607701429aa54---roliloz.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5c67696a4---fejapifaliku.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/20099702413.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE52 21608 bytes
SHA-256: 7301e92cb11c0cd160aa8ddd27a6850081401be1f7ce21882ecc0841076d5ca0
font_01_sfnt_off0002236a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2236A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00023b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23B78 17156 bytes
SHA-256: fb4d69709f7d7df8e13b7a6cfed86d917028dea79c0ecccbbd7afac78c4f0ecb
font_03_sfnt_off00026d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26D1F 10184 bytes
SHA-256: ee59be55db80991453d712cedaaedf08b06052d967eab1e3938b0b54d89069b3