Malicious PDF — malware analysis report

Static analysis result for SHA-256 a107cf8105922d24…

MALICIOUS

PDF

76.9 KB Created: 2021-08-14 01:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1ae2f2883f13483096c76cf9556f399 SHA-1: 3bedd2e653e0c23e89de7794342c694370fc9315 SHA-256: a107cf8105922d24e40d4c8d4599a60d71cf889ce40a791e412bf571fee54b1d
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to execute malicious code or redirect users. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5342

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://anhuizhkj.com/upload_fck/file/2021-6-23/20210623130111894785.pdf In PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ab0cf144a8f72a08dd3d85fbce78b8e/mozume.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/33486468729.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/pedusoxosevasop.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/86529624900.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/kiperivivomevewenetukatig.pdfIn PDF document text
    • http://www.provinces.cmcgeneralate.org/files/js/ckfinder/userfiles/files/pivewe.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a519c559e---90475325047.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/rodunenezagaxisuganimot.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/fimotifepo.pdfIn PDF document text
    • https://hoongnau.com/upload/files/86318075867.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/31839481682.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/f0c9a4047fb77fdfb3b6634b57cb5614/42390102542.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adc8f9b5aa9---tasugabobebadusis.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/gisolupabekowadutugakafa.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/17187135273.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sikigisanefewagudamipeka.pdfIn PDF document text
    • http://tipiland.net/upload/file/tebanumozosutinavateja.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608615fb05771---lufolifipaduxalabilod.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/45273783197.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/volenokurenoma.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/befevazarasagilujedajuvom.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/31266528109.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/f007cd4b31f52a25eeb793347706d584/16127755252.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/97426625583.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/mugozijegabogivasevazar.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/xokovurowodaxunolabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=download+film+dear+nathan+full+movie+lk21PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D8 10968 bytes
SHA-256: b9dcc0250ce9a25b3ed3afdb65db073e20630ed4b4c1969eeb1e424105298f66