Malicious PDF — malware analysis report

Static analysis result for SHA-256 7270d8d8a2dbced1…

MALICIOUS

PDF

90.5 KB Created: 2021-09-01 03:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3ec301c790400e8b30e548b9bd5faffa SHA-1: 852a2749471d38bc1950a44d40e3afc6fcfaf296 SHA-256: 7270d8d8a2dbced15b60206b5f2cacfcd8457f6d3a6d336d6f86360342e99f6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to trick users into visiting these sites, potentially for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=resume+for+mechanical+engineer+pdf PDF link annotation
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/40596950296.pdfIn PDF document text
    • https://masihpt2.com/contents//files/gewiza.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/3178516950.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c81e5548050abe3057667dd91cf04607/20661086664.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/wumon.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/romoxibaxisolewuzowasetob.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/30498953581.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/64918489144.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/niwanakiwomagaxiki.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///33087255919.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/midasopileniwo.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/sorubazigapumunamozerok.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/58908955704.pdfIn PDF document text
    • https://best-label.com/upload/files/pusuxujamari.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/dbbf8f0b67319d1788e67bf712ab86cd/xekiwegabufuwofagifu.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/40455483800.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bawaveluwenuvawok.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/kljd6am0uupetlr2a9a1bdvqc6/tagajufuzekatatufivotu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8763750b1d---ponudejasasoxizefodew.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c6e646d17---mezezujunofajikotex.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/dulibibidudoxegopu.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/um50fgc352eloch8g2ifp1emd2/27293055094.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/zopoberidipel.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae847b60e5c---36310274514.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_off0000fbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDE 18120 bytes
SHA-256: 0ff0f20aa89380f83673ba893451a3b16d8d04b4269cf9f661d64c52cd75c31d
font_01_sfnt_off00012acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E6 11112 bytes
SHA-256: 43b6be9f181dc015615cf12ed34f3bf93afbfd406ee8bb2c5de51c5eaf9324fb

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