Malicious PDF — malware analysis report

Static analysis result for SHA-256 140c9cddac556975…

MALICIOUS

PDF

76.1 KB Created: 2021-09-06 10:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c4741a615d7ba40fe8c5b913ea5f7361 SHA-1: 8196a801aeb8f17ccf0373d516bbe00f3db65521 SHA-256: 140c9cddac5569759eda47309e3e03d361694180438480ddefa88d1e8f307a67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. These links likely serve as a link farm to distribute malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5058

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 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
  • 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://chcial.ru/uplcv?utm_term=bnsp+201+pdf PDF link annotation
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161098c37db807---99892732683.pdfIn PDF document text
    • http://unityproductions.com/upload/files/38100290170.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/nubilubevan.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612629bca9fc2---89354467372.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f94259477e0---bupodasidutajizebumodaf.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/91042eb36dc4a98b793540bd2c68caf2/gixizitita.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/0ntoj9t72f3s5f1onac9a31s83/duzanejuv.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/pinemerodibizamumarefe.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/dfbab48a22124a791e2ba7c90485657a/zizadufo.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/nukaxurolutelenetex.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/2a889cfd2bf35996840c5b8e9150d94d/86961718442.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/gunif.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/40a2504729bcc4297db350866e7ad64c/86569420025.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d7519b3057967ad013560e9b3feeff17/82301489382.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ef562c28ef6ae719755a41a9d7fc4f74/43573677271.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/21646313313.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/67820555869.pdfIn PDF document text
    • http://dsagco.com/Upload/file/54456792672.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/20015812086.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/suzoze.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/3e3424bd985f1b8403ba27ebe7277701/riluwedenodisufu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbafca5633f---64868420833.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/xofomitebuvogotali.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/lajuzir.pdfIn 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_off0000cfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 10088 bytes
SHA-256: 43130fe981aa0f0e9f0babd58115350dc678efc8155130ab75f8a816c6dcce41
font_02_sfnt_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 17320 bytes
SHA-256: c2b8452b2c1b179bac986374e27ddeadf974b57678f452b770777a710106d874

Open this report in the interactive analyzer, or submit your own file for analysis.