Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a233278b6a221a5…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 02:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3bdc536350abe9c3f187fae545836f95 SHA-1: 331a7acef3512ad16c745a410f17359b84080f8f SHA-256: 7a233278b6a221a501494a314b93ada69d2c7917ff1ea8a508838f19a8f30283
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, several of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded links to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 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 https://crewmak.ru/uplcv?utm_term=how+to+upload+app+on+play+store+and+earn+money PDF link annotation
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/megefijoravumosuv.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/f3e90d754d23d95645d29b0818e7287e/12255584083.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368c644f29f---29457091157.pdfIn PDF document text
    • https://ags-car.com/upload/files/fafunivotikuw.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/banatisumufagozekobafufo.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/65712627367.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/fesajadogegojepadofavub.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/36802353021.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210907104707_tejwgy.pdfIn PDF document text
    • https://webmenuplus.com/images/file/fegimexidikini.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/8865363310.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/refizubunopoxo.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/68cd35b0303717700de4f2f5683a33d7/zujodunavusakiv.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/xoruboz.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/tatipaxe.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d13b8f22825a05a83b8c6b12127d9885/87590324385.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210901073014.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/barisifovopelelatewetave.pdfIn PDF document text
    • https://ewt.cz/res/file/lojosotularijomesonoj.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/noxebeb.pdfIn PDF document text
    • http://foxadv.net/file/tazikeso.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/47834785951.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/48701387093.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_off0000d91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 16988 bytes
SHA-256: 03ec7d044d315aed3ce793be39c5ff30120244c2c975eaa0f9df233bf4212079
font_02_sfnt_off00011d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4D 10752 bytes
SHA-256: e396e7e174b1cdacdc6b07b3a919ea5632e55e9d732532611ae51a8ea894847f

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