Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ad3ede34f98eb6…

MALICIOUS

PDF

110.7 KB Created: 2021-07-06 23:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dfc7ab15b48d96c7fcb5a758f32cd0ec SHA-1: 82becf5b82294bb80500cef01640693d26ee5f7b SHA-256: 87ad3ede34f98eb6235795f28f516aa580bb9588c4d8a4d72200adf87a9105af
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The file's structure and embedded links are consistent with a tactic to redirect users to malicious content, likely exploiting a vulnerability or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=levitical+priesthood+in+the+new+testament PDF link annotation
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ec5dec9d4---ladatufowonelididezumino.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/62456439203.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16079b2dbab725---tasokibo.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/db068fed95e769eeb9b705ef1a2cedb8/30211204164.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/joviminivakenik.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8976226ec---69050874766.pdfIn PDF document text
    • https://zhansq.cn/upload/file/wubudisixaviropewipadu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/3db38674334338a2299686b15926ba89/negujugu.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/18519978631.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c85336b2b58---82144344504.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de9562c8cf0---vejeb.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/418122383.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b641f33890---sorupaguvonusikin.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087df3fa33f9---3207799966.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/24834899840.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/68df0e209d4f9d2ab3a952f122d24c02/14013241821.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/jafogej.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/f713fe77c4f819df8d4e9047c943c593/49698568068.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210603_061127.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc67020144---15301633555.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa86220c62---29354535658.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/ca77bcaecd0c1aed5de08db7e85f1f10/64994688823.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8606c33db---46823769851.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_off0001312c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312C 18724 bytes
SHA-256: 628725f7ec3d2cbba207c5e0da483f79bab94d72cebf32016b222987fb03c9ce
font_01_sfnt_off00016166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16166 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17977 16880 bytes
SHA-256: 97452558d77446816f2973bdb9e8e0b5884d21bd2c907b1903365b56b1ee9d82
font_03_sfnt_off000191eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191EB 10888 bytes
SHA-256: 03466478da0ae3a430ede5c109543b02a3e843bcc58edf66b6be309d7ff6e048

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