Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b312d5bc2eb9069…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 10:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 46d82c569d131775c68cf38342ba2cf9 SHA-1: a6c303c5b4043367381fa6e3b8b644c84fe4d071 SHA-256: 3b312d5bc2eb9069632822b96079831c03680a9d00c2a896dab9b537b82934a4
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the distribution of other malicious content or for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://mandarinusa.com/userfiles/file/1626632733.pdf In PDF document text
    • https://dovolena-jiznicechy.cz/uploads/71300980048.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/tojagawuzategipew.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/65434161365.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/e73c2a8120f61c92f9c1b88ec11aad61/fonusinuxawotalosel.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/bcc89be3f3bd9cb8cbe5911cad18c004/66667495679.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/pibitufisadidanabaxepil.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/91003106506.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/34019587691.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f33146adc---27380941428.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/f400f3cdd345a319be1524611e8f8328/fojizeremubumiji.pdfIn PDF document text
    • http://kinogigant.com/sadm_files/92619979522.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/r4bdq1o2udjrjj47m5fsgoig5k/rokamexewozelilus.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16075fece7ec58---malanutofozuxuziraxibobo.pdfIn PDF document text
    • http://netflor.pl/upload/File/zirit.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/83656248628.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/42444101224.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c7a14ef09---3694264927.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/xujokenomakel.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/59978996535.pdfIn PDF document text
    • http://genia-groupe.fr/images/files/66387761060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=prayer+for+sick+child+bible+versePDF 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_off0000e186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE186 10784 bytes
SHA-256: 649c1b0c4fca35c3a4120d95cfa5688e3988a652bbb3ad9ce3d5f83dbb3c0286
font_01_sfnt_off0000fa7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7E 18464 bytes
SHA-256: a7d806d79601c30829aefedf8df1e599b9e53ed88f4eb43f2718fd34d6b3202b
font_02_sfnt_off0001292b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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