Malicious PDF — malware analysis report

Static analysis result for SHA-256 d26c95f1cffeb783…

MALICIOUS

PDF

82.2 KB Created: 2021-08-15 22:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89d9baeb835356eec510f152a08452e8 SHA-1: 683c27ff1ad926a1f5df7f600d82bb0d9487d408 SHA-256: d26c95f1cffeb78348d2d5bf5bd3499ddb29689c824b83b5f13cac9d13c29f48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Some links point to compromised WordPress uploads and disposable hosting, suggesting a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://au-coeur-du-temps.com/userfiles/file/4961756074.pdf
    • http://bethanybaptistcolumbus.org/clients/75549/File/58917088592.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d16461ffbd08d9e912e2e1a6ff034d31/jomadixada.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/662092c5581815f950137f922d48b013/vojape.pdf
    • http://landia-print.com/pdir/file/pafin.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1253ea5b9f---52886909476.pdf
    • http://xnucleus.com/members//member_images/files/lekuxabexululum.pdf
    • http://lindseyderence.com/userfiles/files/10302820560.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/dj753oipbpfj61g14o7q9j2or4/muperinopaku.pdf
    • http://waetsukai.jp/system/ckfinder/userfiles/files/sitemoxenimefixirinemix.pdf
    • http://abcbyspu.net/ckfinder/images_store/files/54805446425.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecd32b7697---42864341972.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0260c9384---50115164720.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/3286665076.pdf
    • http://safiorida.nl/operatori/userfiles/file/midibonivokabijamon.pdf
    • https://daulte.ch/ckfinder/userfiles/files/zepipofavaxewedux.pdf
    • http://biosite.ru/images/news/file/22919140728.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd09e68d036---91715556003.pdf
    • http://bartuceviri.com/userfiles/file/mofefipuzoli.pdf
    • http://schokobrunnen.com/idata/tumetatafewoxinodot.pdf
    • http://bmcnx.com/userfiles/file/kiwoguzutovetiw.pdf
    • http://farmaciafici.com/userfiles/files/71807952894.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c725c6cea4d---44668970759.pdf
    • http://tysons-cafe.com/uploads/files/zoduzapolivufixejukigaxi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+make+ingenuity+bassinet+rock
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d856.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD856 16792 bytes
font_01_sfnt_off0000f068.bin
f560c4896c68ef5bc68b60eadf477f88c363e1b38ced4042f4fdb3826e0c58b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 17412 bytes
font_02_sfnt_off00011e3b.bin
8167a4fb56ab64eb0bf12292dfd190f212d2a86e1e5e6a0f888204b0b490fdfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3B 11048 bytes