Malicious PDF — malware analysis report

Static analysis result for SHA-256 da835e760887dbdb…

MALICIOUS

PDF

72.4 KB Created: 2021-09-29 05:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: deeed095068aeefb09faf13f7f467e43 SHA-1: a29e6e8f563191852b9d7bd6108327dc1a59d18e SHA-256: da835e760887dbdb5574b10b1ccbd827b744deba59e28d34d918f5a46ed45826
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, including one pointing to a compromised WordPress upload directory, and another using a UTM term redirector, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pistant.ru/uplcv?utm_term=install+kodi+on+android+phone PDF link annotation
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/89g1jrvd7dl90cfggvpdv84vgm/wuviremepasukiweti.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/21935862554.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/66368702482.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/44035817202.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/tizutetelanixilutefa.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136efb613b18---47427229124.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/90661053390.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/kekalutubulajovupew.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/rigezavegufab.pdfIn PDF document text
    • http://archbot.pl/files/file/74660294994.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/derofetewavan.pdfIn PDF document text
    • https://istanajp.net/contents/files/winipesikolisaregunu.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/26128505462.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/73828529877.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/dakarupavemupuronavewav.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/belibuv.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f81422adc5---280289487.pdfIn PDF document text
    • https://netlandschool.cl/files/1588493896.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/nidikov.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/gewusutaruriva.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/taxabepisofokekava.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/76804413080.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/71435858906.pdfIn PDF document text
    • http://splogservice.ru/content/files/tefapazinapajetazunum.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144ce766cfb7---vusija.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/19565551930.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_off0000b61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2D 17732 bytes
SHA-256: 94bc704360b55ff7ecca8e90c1059466a14cc6d7191de741396648b920a3b727
font_02_sfnt_off0000fc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 10532 bytes
SHA-256: 32c392f5cdc5ad14dd5f555bee70639fb64a40c3039169083af038f2077facd6

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