Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e897fc7b0971d31…

MALICIOUS

PDF

90.0 KB Created: 2021-08-09 11:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: aec14e420cee25c13c9ea434e332fd95 SHA-1: d3b5fc1022bd8f1849ef67005ee2cb887257a75a SHA-256: 8e897fc7b0971d310c5502bed98d63fb2cbf7d04e1e4400283f8c1ce109d2189
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://drafthe.ru/uplcv?utm_term=how+to+prepare+for+the+navy+asvab PDF link annotation
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc07947c5d---51782139811.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/4bd3e4ea39df1feca7e15bd523040430/86535852837.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/593a6628292a7b1d2c5b695c2da6ca56/13781854474.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d4bc873e883647b6b136cf99478b45e0/28111224774.pdfIn PDF document text
    • http://idcla.net/upload/files/tutetimemipexigowuwuse.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/7d99c55bb1e96f59d8ff75d8ab6d4433/5959763678.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/mis36gl2u583ibqkhnsrtcm64g/87837322402.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5ad2d49f9---kinaxugajinisevogufebibij.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/1c258ea536d0a2b30f024b52432f44c8/zuxixofinoz.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1fd068cc5---40969094158.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/r05co7ap3ja9o7dohfd80buv07/gutenuseluraviwuzelix.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086724f37797---65093593408.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/jopif.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/kanerarigosenudebugeman.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/palebejapubidepa.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/6j00tsugt0muvcrerf20rfits6/81793752248.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e4fa28aad---logekijajugiwetub.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/64371515528.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/d79f460da5421937bb142eae10cb4d79/bijanuma.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/27726901764.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b933494f132---60171892633.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610949d818ab1---39372157080.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20217523101830.pdfIn PDF document text
    • https://flying-vikings.net/UserFiles/file/3322309161.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/17156492625.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/fa7f869d53680b8ded25f4eeedf2da47/41307243402.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_off0000fbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF2 10712 bytes
SHA-256: add06e4faf7c21d61ed13675189956580239e42df90eb4771ad16c2d76d0a775
font_01_sfnt_off00011456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C68 17208 bytes
SHA-256: d4275aae396a7ede4c124397fc8261785f0d9f572de88a4472b366c7b31ae026

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