Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bbafc8f1dde3ada…

MALICIOUS

PDF

80.2 KB Created: 2021-09-14 07:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5980883fbbbdaa460553e842564acf81 SHA-1: 1e4533b730c4e350478dd8647b3571c12eafee43 SHA-256: 2bbafc8f1dde3adacb66a19a66769f26d36951c1cd183ea08606a98f9371dc63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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 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://chcial.ru/uplcv?utm_term=text+photo+apk PDF link annotation
    • http://pinedafoundation.org/imageuploads/file/38625416406.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/55613849219.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/88993111627.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/73470252015.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/42164313317.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/wowekesosopaluj.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/47492404503.pdfIn PDF document text
    • https://x-software.cz/data/file/wawugoguvi.pdfIn PDF document text
    • http://merwepizza.com/upload/file/jevoba.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/27e78b7790e76c25d2036701244624b0/vepogiginikewesar.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/vavanizuzipudigoferugopen.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fdbf1489b---josutofenijaxilinibujapa.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/jutiwu.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/6836842078.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/zoruvuxu.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/67801332375.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/firotuxekupalulipujexepu.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/45b6ce79fdcb48c001d64b5f5286f63c/koxagezotemezudoluxukidid.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/82822680314.pdfIn PDF document text
    • https://ckmandarin.com/uploads/bofanukepuvekotifebi.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210912_092CF48AF98ECF8C.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/55798467270.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/nupuvanigesobanonowi.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1dd1db44e---piliz.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ba5ea89ce---dolexe.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/zogekifamunudig.pdfIn PDF document text
    • http://ahchala.com/img/file/62217231931.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/59573179147.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_off0000d79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79F 9996 bytes
SHA-256: 2053f279eb1f6334ecd70a890a4021fdb8bd5f826ea3069c260cc7f003c42563
font_01_sfnt_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 17796 bytes
SHA-256: 957504141602329365f0fbd36d010541989f636246452169d51e9d213f397ccb
font_02_sfnt_off00011b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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