Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b0d9e2fd82c1ef…

MALICIOUS

PDF

80.5 KB Created: 2021-07-28 04:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 85a1084d0fb4f5ed053ce3c68bf2a5e0 SHA-1: 0fa6298f00b8086174cf6829234ff7403659af1c SHA-256: 88b0d9e2fd82c1ef7ac03a22266160f2713626564ae3ff0972a7d6525d601d5a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://thicongdiennuocmiennam.com/uploads/files/limewu.pdf In PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4662ee5732c38379064fc655aa6b8a06/92556883421.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/gnngs0d101q4ftc4h3afte4aa7/98949930857.pdfIn PDF document text
    • http://talleresjpg.es/img/file/2021687397.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/746ri0c1lq4qca9l68s3r8ugao/vajirokuxuvibat.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/17b28457515ff0c2c743961367f076fd/26918453100.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/8foblafuu219s8hj1otphc0nb4/rexibejar.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/14180888956.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/90316861395.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/iv947vu7jgo473r0v83p3g05o0/69988848469.pdfIn PDF document text
    • https://chp-travel.ir/data/file/wuwafalo.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ohrdtpfon44pgjimns9kemtsvi/73444403484.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ba2cc327e509dc04c26b84300ef33ab6/geponofidukakizajetilowo.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/966ndrt7chhsqbk2q3vop8nn68/fojel.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/jafalivole.pdfIn PDF document text
    • http://stepsforstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/girupibujomuvoximanu.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16085a84e17b3f---46843505095.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b5151eeec---lezafun.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2909f12bdb7c329df42b4b56066b6bf1/46248462028.pdfIn PDF document text
    • http://plncse.hu/php_data/file/damop.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/95187724917.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b8781d51a---66281255936.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/41872381946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+connect+logitech+mk520+wireless+keyboardPDF link annotation
    • 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_off0000d3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 11616 bytes
SHA-256: 03ca993795b6a33b24d32598192d94c4376ee869d20ea18fdcabd7b6e0ef9927
font_02_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 17288 bytes
SHA-256: 55f9b5ed18561511fc293464e963e3d3df3865d99cbf4bc718a23e825ac450cc

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