Malicious PDF — malware analysis report

Static analysis result for SHA-256 5371d7e7cfdf950a…

MALICIOUS

PDF

88.1 KB Created: 2021-09-07 19:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8f1ebf360bfcdfd604e96efe13f82aa3 SHA-1: d5d0720315829fc6a9e4be35d61f5d17488255e3 SHA-256: 5371d7e7cfdf950a693719f4e2787c18dfe169619cbad1efe353e1e3ee8ff2fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm characteristics indicate a phishing or SEO-based malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://donelreunion.com/clients/5/59/59051ae02fa593b10ab13f41bf6316a1/File/nadixesokifepikewuwekufa.pdf In PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab64464517---95319964057.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/14247515190.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/63169763140.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3d3441632---37012010892.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f115ea99a---ferulepogewegox.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/68693421007.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/zajifewelezog.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/fawina.pdfIn PDF document text
    • https://kiameds.com/images/upload/files/puwanakimevojadevikitipop.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/zejotem.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/6486269108.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/72991684193.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/rafaxes.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/51169982860f91fe1cd8ed.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a484daf802c13da956455f7df3338303/41493004957.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/denotubobifepafilukif.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160719db65480f---44595639302.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e9fe8eb024bf9a131f8ec07dcda54f42/zomix.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/bididu.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a907e038aaf---7956933604.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/28837620058.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/9c04454bf9964a0b27f77a43154cbfdc/24556426509.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/37403314339.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/fawuzadefita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=tenda+n300+universal+range+extender+manual+espa%C3%B1olPDF 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_off0000e8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10100 11468 bytes
SHA-256: 236690ecfb6c51830bf97eaeacafda97242839211f634516b80028c1c9d84e7c
font_02_sfnt_off00011bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB2 19712 bytes
SHA-256: b95658e176e428aefbb790ceb3eb285acd99d5c9d32a430433546ff1e4f9e8e1

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