Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5c1b3ced7c968e…

MALICIOUS

PDF

85.5 KB Created: 2021-09-03 16:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4a06005df21d2de170a415f2ebe64c8 SHA-1: 63599a7102381bbd294caeb88f4565870ec3ab6d SHA-256: 8d5c1b3ced7c968e6899a4d191469307b0ee733b8bdac2a6e9b444cb2ba49921
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/918u64hje9tbdpirs5hh3ihrj0/ripuvululalime.pdf In PDF document text
    • http://ztkammer.at/uploads/file/65602766861.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/nevogosowumedizaw.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/sitekenetefutabaja.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/xutijudefufixegajexori.pdfIn PDF document text
    • http://ihvanturizm.com/rsm/files/54336793279.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/3aoqv82cud7fr1ecoi02gjk94a/pokit.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/37639117027.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075431c46e0c---42148280137.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb10fec2ad8---49953486631.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/lonujunovafetug.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3972975a01---wifixosud.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/wenisolugogiliv.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/pmpcnnpl9kh6bmt001e3ig6h84/zofatetuworufafu.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/sipugadagejot.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/vokepusojuneboluvuvofonez.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/39981662453.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-7/20210607132226859375.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/pegonagiriruvakusodavu.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/5514061232.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089d8e006632---kapuxuw.pdfIn PDF document text
    • http://alcantara.cz/data/file/96081213736.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/69728422890.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/40838613536.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/71488137976.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/82792899970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=english+expressions+in+french+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_off0000e6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 19348 bytes
SHA-256: 6989defe7e7fb6fe5986404354a5de1af5f541078e3daf1334b38ed346f01411
font_02_sfnt_off00012ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF6 10724 bytes
SHA-256: 6e9d9f3ad5b2fd7c3b49abfc76cd314e9ac8b88fa1b048e0f9e52f5c6791908c

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