Malicious PDF — malware analysis report

Static analysis result for SHA-256 bacd5936f581e749…

MALICIOUS

PDF

91.0 KB Created: 2021-09-19 14:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 26e06ef92541a1d8f954e84a34497d20 SHA-1: fac7932692cd7faf11040cb09f595606f2dc51aa SHA-256: bacd5936f581e7497a3ac778a19d6246e8da0fa79c94974b72716f133cc152ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with a phishing lure, likely attempting to trick users into downloading further malware or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://synerhu.ru/uplcv?utm_term=contract+killer+2+apk+mod PDF link annotation
    • https://jkmart.net/FCKFiles/File/konafubatixefo.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613000ae99755---sefagududafatejoxopu.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/6f5b926eeb313d035b25dff10fbe8feb/jexegatifamuroxuz.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/munezoxuwo.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/94688266725.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c4506d226---feridoteradez.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/zipedi.pdfIn PDF document text
    • https://andana.us/files/files/lejuruxorudokup.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdf7437817---22680683547.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/pexufusutugewojujufakafa.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/nrrs1opav01q3fdogh996m1r69/77503571925.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/nileguxasonasabewimuzesok.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/59112011968.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/bijeru.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109151548233845.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/92021622258.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ref52ug3k8l05dijqtn847h7h1/vudanuwojudawologivupefit.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/lebugawajulalubolus.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109190858156663.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/zufimopuvovobetosib.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/81865116639.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/99386542988.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/wofifide.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/51950198693.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/dowosol.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_off0000fed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F0 10748 bytes
SHA-256: 801e4ec8cbd76a25c2053a456fbd19a33349c69f750ff78b1362b839ed46c77f
font_02_sfnt_off00012fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB0 18156 bytes
SHA-256: 392903c0114120a4e2d4f2e673301787090a2090ba5d48ee6c9c86cc7723e6a6