Malicious PDF — malware analysis report

Static analysis result for SHA-256 22190b5e60680995…

MALICIOUS

PDF

126.1 KB Created: 2021-07-08 08:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 27658bec9236ae542b4685c0f3d379e0 SHA-1: ea94c8cf03143954895511a5d249ab84f5425d71 SHA-256: 22190b5e60680995aa428b20dea426716b562a272b07bc927da90967203c27bd
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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.
  • 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://a2itsolutions.com/chop/multimedia/userfiles/file/wivopogu.pdf In PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/82a77cebe89ee615302c911337a91209/15058379288.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/voridatoxowababugew.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607533da0a0f6---juxavikizimodipasilux.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/db4c3618abc0395d91426e5cd71e0a5f/xusofusixeminugilikimu.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/6441553823.pdfIn PDF document text
    • https://grnca.org/img/files/files/78290220640.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/97131316247.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/0ccb8b18bb58d31b28d71738605c5b88/jopurugonibubor.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a2e9219a0---bifewefubapo.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc55e93ef---kakepopimajeba.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73d42c0399---beniripuvezagominavo.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/78530384554.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/60584141078.pdfIn PDF document text
    • https://geniodelweb.com/file/vogani.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/93308485496.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951a95a004e---jisisow.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ba7e28cca008da2ba010fcaaf2d6c89d/bimemitugigavikojoretin.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/25681449057.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832762b5ad4---wirekixinor.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/palijubimiwetilafuzekover.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d7aaf146d9b58beb39769775f1b1b850/vodejegabosefomexifadap.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/lirijixatirup.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062721554498.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/65886823018.pdfIn PDF document text
    • https://maintogelonline2.org/contents//files/40195510553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=do+you+underline+book+titles+in+apaPDF 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_off00018acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2DF 17592 bytes
SHA-256: db524510cfb257e210310419a63afc8b5286c673e18ad4c9e1dff86a988e5e10
font_02_sfnt_off0001d158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D158 10832 bytes
SHA-256: ae52d79b7719ff1e4aa7ad1cd5a17b565a370628348ad5591d0906b8183d826e