Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ae8c0bc3f08819…

MALICIOUS

PDF

114.9 KB Created: 2021-09-05 02:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8eb32a3c2ce62519652e57b2e62c012f SHA-1: 47a7e77dc9f6dfefdbb11e95cc4f7c5c5f29f7bf SHA-256: 72ae8c0bc3f0881913478890841ba576457927dd2a85122b19c45b8189f3577b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to host and distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure implies the document itself is a lure to download other malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

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://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/n65tb8ckt6rmvvn13vgg8ockmc/26220033677.pdf In PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a0788d9ff---wefinotevivikewomujofes.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/41574658975.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d195a2f95---zowanejifitil.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f206f339220---77034097127.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3718f491d49d847bc3c306975fbccaa0/90800575274.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/91746776685.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/vejuwemolazutizotan.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/5fe9ff14a94240ca0d6c494ea4c9be12/sejoxeputuvozuvudapukir.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a7c7a231e---bunetokaxoba.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/b17af0a29a5db96f21a56ce8b50fcfed/73121145763.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/53732071174.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/87f85f44bdfaff62e1386dfe6c68181f/xakixosetow.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a93ff20df---69764870042.pdfIn PDF document text
    • http://contua.org/userfiles/file/56101291924.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210701013539943.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607875b072650---xizeritadivukek.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/ponetukixenetopobegazopa.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/85968649368.pdfIn PDF document text
    • http://chromavials.com/d/files/duzumironapozimonibisum.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/xokenev.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/aec13db97468b08170fb2fc026f3af71/mesedunizizemefek.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/9697089305.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/98747735634.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a00e8be49975a13af322636564acece2/pofepepopebi.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/99947887463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ni+maschine+software+manualPDF 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_off00015a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A96 19248 bytes
SHA-256: 6654000846809fbe5a830978c94a785a3c8f12829fae8a472a38a4805c8b15b5
font_01_sfnt_off00018cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A513 10764 bytes
SHA-256: b2502dc0b7712008976801546f8d79e27de53d328449b8c15d4453bb5206d59e

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