Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b7acfd5eda0ff0…

MALICIOUS

PDF

84.4 KB Created: 2021-08-30 13:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5a98894693c075670744df910fe5743a SHA-1: 35b89996b4c1425d3ddf6b32bd04a2ba94cd5973 SHA-256: a4b7acfd5eda0ff089f7f9f0ac3feedd2f578104a12dd8f6d4d7cdb43f6d83d6
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to potentially harmful websites. The presence of multiple compromised CMS upload links further indicates a malicious intent to host or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=hack+android+games+2020 PDF link annotation
    • http://jnnycc.org/userfiles/file/wilivegunab.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/tuxavetanirifenejaluz.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094359137879---robusebena.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/63270916155.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/91ab3db30b62aaa79adadb2342af3fe0/figafirotenofowugawa.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/67498187698.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/b4b9259121c2ddf0603a1fb57c7813b6/52833756314.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39b6dd9ad2---jujadezelisemoxuz.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/74043da3d14017fab0fd4c139b8d795b/68414956828.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/bumototumojexopedenoge.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b73a37d1239---58470812294.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/43678717072.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608a92ef67566---reparedav.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/54639075463.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e8812711f---lavawukifikupijubuwase.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ng3nrl2p033tk2amanpl260i8p/nipod.pdfIn PDF document text
    • https://retta-bg.com/userfiles/waseguketi.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/054d0ec0064e6b4fb92a4f3fa1c73076/84339990160.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/23500888920.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/sipemuwemuviluxof.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e331f436bad---sifugatefen.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/fuduri.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_off0000e63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 17204 bytes
SHA-256: 325ab148fcab6acfd22294fa3b4f3eb4fde5634b295d1b1b3f5dd935797912ea
font_01_sfnt_off0001127e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127E 10892 bytes
SHA-256: 265d6d5305def2772c1015f6c1b7a998bd53c8df347dd0cc10beaad096040d6c
font_02_sfnt_off00012b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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