Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7846507fea7d56…

MALICIOUS

PDF

90.6 KB Created: 2021-08-18 18:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43725082bc67c0af59fec23cb6a6c5ce SHA-1: b17aa0f6e42ed2cfb05c1485516b964784f3f101 SHA-256: 9c7846507fea7d56fcd493903a3064b39b4fc551be88ba82863b4765aa73cd72
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected by ClamAV as Pdf.Phishing.Trojan. The presence of numerous links pointing to compromised WordPress uploads and disposable hosting suggests a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the PDF structure and URL heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5fd7d7957---4178506492.pdf
    • http://zhengfutz.com/v15/Upload/file/202162559511552.pdf
    • http://mdsalon.ru/img/lib/file/72168212267.pdf
    • http://esen.life/userfiles/file/33945706735.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/68663054552.pdf
    • http://caopump.com/admin/userfiles/file/wefedikokem.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d704c1f857c98d5b5262b71923031a07/23214042292.pdf
    • http://iaestedresden.de/userfiles/file/47031788928.pdf
    • http://opusincertum.it/userfiles/files/xukesivegagufiwivem.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/norejaduronolusenufoputap.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b34e128504---1020073045.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/633b2425a04f114b0ae4ce93b6567db8/wimesofiwapuwelofavago.pdf
    • http://moorheadhigh1970.com/clients/c/c3/c3beaea4c2dff0dfe15f0c96d12524a1/File/43388529990.pdf
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/70012845426.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3bd5452545d90d18de4b0c30ed4f828c/jivekaru.pdf
    • https://alutat.com/data/file/siduzogefiziji.pdf
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607584adab94e---548902160.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082246cda888---58825834537.pdf
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/juzitanineju.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f4e0e28e6c5---tigosodarasow.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c8ea7409a8---tajozimexuvase.pdf
    • http://guojingmall.com/userfiles/file///72931919711.pdf
    • https://kovosluzba-praha.cz/res/file/54248089132.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d442ad9356b---xivimususoxazojupofuwo.pdf
    • https://zegabilisim.com/calisma2/files/uploads/xurigupakemefemakid.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=tres+metros+sobre+el+cielo+pelicula+completa+descargar+gratis
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ae.bin
04f15ac097623bf2066857991aa9c73ab7b6a91609420bc1b1aa46c11fe567e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AE 10956 bytes
font_01_sfnt_off0000faae.bin
b5d97019f45235b9fa930b679ba57de1e0fafae91cf1e4f2383eff16435b1ee6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAE 19708 bytes
font_02_sfnt_off00012bea.bin
ef0329dac4803480f2d6f4d9e9c4ba3aed2817dbf0857a17f9b8becfccd91a33
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEA 16944 bytes
font_03_sfnt_off0001433c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1433C 16792 bytes