Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1351356e7896b0…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 16:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d930f206dcf49335fb9df4fefb41e096 SHA-1: 4ecfb76d98a3e0a1f9fbcc405f00f74741ce2d0b SHA-256: 6c1351356e7896b0fbc6676c687ae79a12671d2e8dadbfa6a3bc58afb93b8838
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm or lure to external malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the file's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=brainwashing+the+science+of+thought+control+pdf+free+download PDF link annotation
    • http://www.thaitofu.com/image/upload/File/noxatatok.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074332b8f711---wusixemujirupixanojoke.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0371b054d---kisar.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160771dcd2a91e---zevogazugipufuja.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/sugupuf.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210429174613128.pdfIn PDF document text
    • http://eko-uklid.com/files/file/movog.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad72c26a26f---18491707558.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/48928119726.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099b1b5bdbc5---43145551775.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5d336e843---57321824912.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff31d8a772b---82067994906.pdfIn PDF document text
    • https://lesura.net/userfiles/file/97750198482.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/tjr7ju79shqv3fgpr03efkcr66/44381383185.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cea3ee2e536---99007287719.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/gukitox.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/79a048735476ca426a232b9581c7c696/fugalefigusiw.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d8b2ae46711e88b16f0866ac61a984f4/88278921988.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/saratux.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ustim6b2l19fkrf47a1khhef63/18582463432.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/20032960560.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lulerifakadoduk.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/39672770061.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210730154747.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/vedaworazuvoteliz.pdfIn PDF document text
    • https://bbdirect.com/ckfinder/userfiles/files/50545954290.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 17880 bytes
SHA-256: b1263f93bf5adcb21151fb58409ac171b57e89eddee37c86a4090f511f5e516c
font_01_sfnt_off000111e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A00 11140 bytes
SHA-256: ab38d11d419d8737cc3f4f5c931e6db174246c797db5b650858c31e6ea05276d

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