Malicious PDF — malware analysis report

Static analysis result for SHA-256 43315d1a687dec9b…

MALICIOUS

PDF

129.1 KB Created: 2021-06-26 04:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cdb7c77127562a3d97da030158ecc9e7 SHA-1: 8275c32d0ed093afb042bc04ef14f07a1e6c384b SHA-256: 43315d1a687dec9b9bd8483bdb3fd9d2b70453fc13d84b6fb7338da5695778a5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing phishing lures or malware. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95', and ML classification strongly indicated maliciousness. The embedded URLs suggest an attempt to redirect users to malicious content, likely exploiting them via a spearphishing attachment.

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 https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ulrpnlm8dcoig79dq6eovb58kb/xedidapelusined.pdf In PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210608_96993D2C4119CA5D.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/83dfe5ade61a13a7f91f9834fe5acd29/luwifagebaradegum.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/penulumedoge.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/68187782395.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/cd071586dfbce986380051383543b12c/lumiworuwa.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/150266070960c429bce6793.pdfIn PDF document text
    • https://dm288.rs/slicice/file/durimedej.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/9a26a7f87ebb0c1a81e3715d23cfd797/runazakafik.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/qqcsvpnkhpihpqqdg5f5uruhim/72793370044.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/f05141a639beca79f7af21fac43b6932.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/a99e58b5143fa36dcb54e21a4a4c7f90/28867769277.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/51834109015.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/gulofunajaxunujuribewuso.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/7eee2ad64c53058cb39a67fa3aa03dfc/57975491495.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/46745973850.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/kesajipawu.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/76999938250.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/nbs2ksfce6nr81pcrcr2lnjmdr/zasuxozadelimub.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/gufabifebizirodidiw.pdfIn PDF document text
    • https://lemanssrl.it/file/bufofakenijebutasep.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/37a30008668e65628a8cf701adf4bce2/22914549617.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160716b0a7adb3---59460097386.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082506d83a3a---nolirujugopafuwasotepadi.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/525902ba760dc0a1be08962556837e86/nubijujipag.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/71504514504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=immunogenicity+of+therapeutic+proteinsPDF 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_off00019603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19603 11044 bytes
SHA-256: bd04f39be6c262536219da8f4d8608f94cb396004880d1160b3110ecfba36af7
font_01_sfnt_off0001af8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF8C 17860 bytes
SHA-256: 9ae0cf852886128ef3555c3d804bf718f3eabf82d166dd732eeed79bc8f4998f
font_02_sfnt_off0001de6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1