Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a770036528019a…

MALICIOUS

PDF

106.4 KB Created: 2021-07-21 18:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a959dec230ccd5fb2636e3ee89cb5330 SHA-1: 1b1cd76079435db7fd2cc5c25b5fe1b23855eb16 SHA-256: a8a770036528019aeb8599af7f67ecdf41eabe3b80f87ce60e508e7b1ab006cc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The PDF_RANDOM_URL_LINK heuristic further supports this, indicating links to algorithmically generated URLs designed to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://taiwan-casters.com/userfiles/file/78554023582.pdf In PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/aa4lej54deev4emdv1sqd9cl52/6092489862.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/vibamowexiviruto.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/sonakipozedofakoravodofun.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16092e1fd41bb9---diwuwelorewenabefade.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/nevajarorep.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/pedijutavusobol.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/51338fbf86fb4248f357f662f6ee0c84/vojeneve.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/pkntm35mcngeme8ui5sbh6c2hs/remaropob.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/nsnph4hbu0vtkd2mq0ump9m4ok/1574671036.pdfIn PDF document text
    • https://auto826.com/uploads/files/fasapona.pdfIn PDF document text
    • https://pcstaiwan.com/ckfinder/userfiles/files/22055004704.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/bavapeju.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5916eac7d2---13492130796.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/gobigidoborubibonaz.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/ac65e512a868f264feba7d600453b503/tadad.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd70ca5a24---luvusobexarijegut.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210621040737.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210717102358.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160befb731a86d---xusofibifafugo.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/6b68e56e97156ea38ffcd0886ab93a85/42121624457.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160727ea7ae482---69176381589.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/u31jmr69gvv9fbakjveamfj856/15460370312.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6hb1e9s712s9o3f7dvmbsodn97/11748052495.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609476a7b19f6---83490184568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+swing+a+driver+for+dummiesPDF 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_off00013ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE1 17360 bytes
SHA-256: d1e2190aed2cfe0e212f58e968a2518e740d37b710f9e2567f49b6c6833bfbb1
font_01_sfnt_off00016a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000182ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182AD 10896 bytes
SHA-256: 1497ac2fecee88eb0f62f2c556a49e4133021197841f35e9a6a0a92a4f3f4dd8

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