Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0ca9b83b66ab29…

MALICIOUS

PDF

98.5 KB Created: 2021-07-08 00:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d25482f6d314c1a577cd6f9353e0a5d SHA-1: 8bbfeab501bf339c54be31f032524fd28fe4205d SHA-256: aa0ca9b83b66ab29b090077fd23b9433a2ed666897c1ce79be42dd35c469587c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f24f57a608---20786243839.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a05a6454a8---gunut.pdf
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/zokadisesileb.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2728d6da5---3029636166.pdf
    • https://kvkumariajnkvv.org/singhania/downloads/file/46375465750.pdf
    • http://capmar.eu/userfiles/file/luxufujixu.pdf
    • https://auto-rujo.com/images-editor/file/18492354062.pdf
    • http://sirmamedia.com/ckfinder/userfiles/files/21233396499.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088501949e3c---wuvivupigogor.pdf
    • http://renknh.com/ckupload/files/zedodelefi.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075f1c8a0d4d---berobixu.pdf
    • http://frangarcia.eu/upload/file/ziwome.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/84a1aa4da8e7c91b225b8d4ba37eb38f/24227323395.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fa25b4076---puzezorinogutexoku.pdf
    • http://www.victoriousintl.com/new/resource/files/ripipumokodezolaxasiboj.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb9db93d27---91250570172.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6e977fead---42186160526.pdf
    • http://biemmecommerciale.eu/userfiles/files/debof.pdf
    • http://jnnycc.org/userfiles/file/lezuwiviwakireremudozuje.pdf
    • http://brandnewgoods.net/userfiles/file/jirusokebopeso.pdf
    • http://thuexedanang247.com/uploads/image/files/jidun.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/cb75e6699e9f030b16a30ac97c507eb8/1137583850.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/78276686324.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/1fa8700e482366c01d8b06aedfbf0383/manunesuxojeruvolunalox.pdf
    • http://absigorta.com/E/file/garibipovunekagi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=low+anglican+church+near+me
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cb8.bin
85a3f908bf3794fd8811e13e0bb772e6389a8651308c03609261d5d25f24a2ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB8 10556 bytes
font_01_sfnt_off00013499.bin
f9e5d111615b5028c55e6f13ab1795859bd03a65be2a4694db642ee0bc3841be
pdf-font-stream PDF embedded font (sfnt) at offset 0x13499 17976 bytes
font_02_sfnt_off000162e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x162E0 16792 bytes