Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c5de21f422fbdf…

MALICIOUS

PDF

90.0 KB Created: 2021-09-02 13:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 99b11337c41102aee0d7dad0ea1e3910 SHA-1: c7ceac2f703ab1ad9f3f92f2880957c6888141ff SHA-256: f1c5de21f422fbdfca61e58c6722fc98d1a01ef78102dad1d0a215a1b6a8151f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple external URI heuristics further supports the attack pattern of directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://myqself.com/upload/files/20645699530.pdf In PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/s11i5hof7avc3e235pp7n72u41/buxuramezarozedubidixapu.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2afb51509---fugaxalezusowurazadufaza.pdfIn PDF document text
    • http://digifast.cz/userfiles/28862836590.pdfIn PDF document text
    • http://immopolignano.lu/images/99386952282.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/39619872431.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/70447792255.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/ncv35i007mn9lc776lm8bohb9t/pimodumaborawinev.pdfIn PDF document text
    • https://webmenuplus.com/images/file/kesugitudodo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfdfe8a9fc---latofazarinagagixiporiraw.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/pakusovunomet.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/80848219549.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/57708867911.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be92b5c3de0---fipijo.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/62690421793.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/42433234437.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/dokipenopazizima.pdfIn PDF document text
    • http://livestocktool.com/d/files/49864812401.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/96641784174.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b00e57a32ec---57148882074.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d0ab0138130---63553539432.pdfIn PDF document text
    • http://wjcopy.com/upload/files/wukapuxuvawubebikogigapu.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/gajexuwapifuzogawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=burlington+english+for+adults+1+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_off0000f6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 18984 bytes
SHA-256: 758bd447c05b2a93df28ea08908664664cf99fe80e672481c13315f305031626
font_01_sfnt_off000128d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F0 10980 bytes
SHA-256: 90017b6831100b1ea40a7d813a57e3bb6fe01a607d9a8784328d44e568eef17a

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