Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa6731fc20d1ace9…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 02:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 84ce1978b80bce9d6ac070592464fb7a SHA-1: 843132f280f5b074ca677948c8f75b1e18c0b169 SHA-256: fa6731fc20d1ace9614cdef8d9d52fcb31b957f460e50d4e65d8c368bad82d03
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://licausi.it/userfiles/files/10416012539.pdf In PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608020a420e05---vufopabobeta.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/danufawov.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/91673634791.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/zubivurisagedikitebaxeg.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/79678227757.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/sjlgq3erlddmq9vjfqqbb4knen/7454084202.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59683f2eae---zexujurunukoziri.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/90602449566.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210702190229.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47621dafd---novasalipujaxizosu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae3fea836.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/zevufom.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/90220458198.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/37402413078.pdfIn PDF document text
    • https://panama4d.com/contents//files/77341294525.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/keganepijuwe.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/e81mvobim76a1o46dhnivbmpvh/guzafifafufi.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/keniwozo.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/newegobuxusutiwirizanif.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/k0thd1m67u19rvr18s4790aup6/joxedasoxuriramabakilafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=krups+nespresso+manual+xn100PDF 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_off0000df45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF45 17404 bytes
SHA-256: 65b7f35f2a6d37f119198beec8f879642373d3720113eddc8cabfe752e0782ff
font_01_sfnt_off00010c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C89 10592 bytes
SHA-256: 55c9e8cc1a62b49c65f46620c7e0e5e152ec415ee06a8641d652990d25af4858
font_02_sfnt_off000124bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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