Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce5caa0f2eecf88…

MALICIOUS

PDF

86.4 KB Created: 2021-09-17 10:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cbe29fba6be63aacbb46b6547bca6c66 SHA-1: 3499f4e0fe7b3053ebbaf6d2ab60c3172c277f6a SHA-256: 3ce5caa0f2eecf887d8cdb97c00249c72615af5b80bfd3a87e685a300cfbeb32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting services, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious link distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://wastran.ru/uplcv?utm_term=app+vocale+android PDF link annotation
    • http://bio-scan.com/userfiles/file/74620139991.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/81728968438.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/gowunajop.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/67079315004.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/moneritetifemoxonafira.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/21840861942.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/tamidatod.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/texare.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/jixovimatizix.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/robizoritenubufegeruxo.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccb8167570---25723988049.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613999ff0fc71---batesulunaselisitopulaxad.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/fexowisajafajoto.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/86787098601.pdfIn PDF document text
    • http://pololanna.com/user_img/files/luxedajedifi.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/14965700377.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/razidoje.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/tesujukezilud.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/dakuzadunirutadevadawu.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/76ed390bbe6c8073456d9f0116387b1c/vofoporoz.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/nenabukemomelorilodis.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210908155224.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_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 17624 bytes
SHA-256: cb1eab457b7db73a744078a6d02a6208148ec2630f396d6bae228039c088e7a4
font_01_sfnt_off00011cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFA 10288 bytes
SHA-256: 2a47703392dc9f1cc3c582b875f79ca40c07b3a02ec1b45b97dfd289652214fb
font_02_sfnt_off0001343f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1