Malicious PDF — malware analysis report

Static analysis result for SHA-256 af40fd37c55f835e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-20 14:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 50b6377afdf9cda19caea3a469c66a04 SHA-1: c76ac7d4ab40d15da8ac9e0da329a9ea580c30de SHA-256: af40fd37c55f835e1e116abb8f2fdfaf06a591c08360630eba21ead19ee59bed
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, with several URLs pointing to PDF files. One URL specifically mentions 'lightroom unlock mod download', suggesting a lure for pirated software, which is a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://angkaganjil.com/contents/files/96609053547.pdf In PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/gekomagaxupoxegovawerage.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/67305402750.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16146011eb02f3---61901408816.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/fuluxujeli.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/rurotewisuvawo.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/85346452402.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/68679822003.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/19430950582.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/40365425968.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c45bd02efd577096cbdb51c36af316df/73239519927.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/sixezodurivu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148331b01c23---66780823811.pdfIn PDF document text
    • https://ms02bet.net/contents/files/94853448504.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/63b5c770ef10cf2df4e3ae19b06bc99c/nilaxisezetu.pdfIn PDF document text
    • http://suaups.net/userfiles/file/duvanubabiruvidebik.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/93914803620.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/gulixoxuwak.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/duxowowavexejopudupir.pdfIn PDF document text
    • https://motecx.com/images/file/19861520014.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/29216112008.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/85065240839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=lightroom+unlock+mod+downloadPDF 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_off0000d0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D0 10752 bytes
SHA-256: 0b1088f5a130738d7bc134379cef25e0a89905824f7f232c45f5831f2e7f4c83
font_01_sfnt_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10144 16328 bytes
SHA-256: 0fc22b92021c8516a1064a32995b4dd65c95f3a015828fe68f8384e17b808dea