Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c029de292c89d30…

MALICIOUS

PDF

83.7 KB Created: 2021-08-05 18:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d79020cc4adda2f41a610cab36683189 SHA-1: a0459583d1fd6a119b52c16c8415a12c1f25c050 SHA-256: 3c029de292c89d30281c6038c081b828121e3a712f947580cbdb8a96e8a3fe92
96 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier. It contains a large number of links pointing to various websites, many of which appear to be compromised CMS uploads. The primary function seems to be acting as a link farm to redirect users to potentially malicious content or phishing sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 5

  • 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://ketchas.ru/uplcv?utm_term=how+does+macbeth+feel+about+becoming+thane+of+cawdor PDF link annotation
    • http://wabasnb.com/files/fckeditor/file/32522706360dca43763aac.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/rqidler1ce65njc5lo6k7au5ks/ruzikuwufefu.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/vetol.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/17016706872.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/vuguwaxiwokivezisa.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/7d63a98714e39f1eea9c4396f978afc9/13836261891.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acde241520c---2845779042.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/wagorujokaboxagegokati.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/49771965754.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/23a675de9659b43de91faa0fe86f766a/63196097661.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/0f6bc9f8ca879a325ccc28140658f449/gofovisino.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/betudonidaj.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee85f1d0be6---napinevoge.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a2a7aa878---kotaluruxuluxinotujuwod.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/58381762989.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/borijefeb.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/fogavumekifejerumogobavo.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/vijepekakufudobew.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210706_F45018DBC4F7BAAA.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/xelufebafoko.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/krk9n70gev89gtikb9so8hcq7b/98316480222.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9853258499---sejilitijazesiwok.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/94284709084.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/73755404777.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC00 11240 bytes
SHA-256: f9ee6e190fcce11168858f7f194b86b1894de9fa240aefedfbbc2d941004436d
font_01_sfnt_off0000e5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFE 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_03_sfnt_off000113da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DA 16660 bytes
SHA-256: 35af0a49f560b6efce67e981af971a03fca470f146a572fcd655674c6b0209dc

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