Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa081f9fe706a026…

MALICIOUS

PDF

78.4 KB Created: 2021-08-12 05:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4df70df56020d7d2657e2ecae223d72b SHA-1: 0be5088d9d25caaaed3b260cff08fe44789188aa SHA-256: aa081f9fe706a02662dcc60456a4a7c55540cd8bf3f80d6f999b338f7a71560d
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. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve to distribute further malicious content or lead users to phishing pages.

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 http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/fowajebovaxupitafo.pdf In PDF document text
    • http://keramann.ru/uploads/files/vikewutelimikigetidutuxe.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/bewogoranaw.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f889e27fb---13431145745.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17f8dc7ec8---poxuburujurawebibepisagab.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/vazixifepatapopubikol.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/42680188185.pdfIn PDF document text
    • http://allycatering.com/userfiles/wuxotoji.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/6db461afb7480340f9fc1ea42ed0b656/49893013386.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/legodozozax.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b2aacf8ba---xopasozozaditot.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb8a77a47---rekipi.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/darilasatofiferul.pdfIn PDF document text
    • http://m2m2design.com/userfiles/mojatixej.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210507040015_1927760686.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/7gf46up6aa2lrkci5q6urtetvm/73284468169.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/55766655109.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/127bd29e19713de19d4249e03c207cc1/86493496057.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9c05273e1---87899320961.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/50335998256.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/9625750b533a00d6336863e3dfc50760/87904986620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=robo+en+la+noche+book+in+english+pdfPDF 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_off0000cb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB20 10980 bytes
SHA-256: 203817986ace5d78b9c756888726f8e04c6ae259bc8a0b7022ec15fe8b54f993
font_01_sfnt_off0000e413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE413 17584 bytes
SHA-256: 8c40227a731a27257246bba2c37cd195f11844e32ef44506189c38c965de30cb
font_02_sfnt_off00011165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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