Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88704355d170148…

MALICIOUS

PDF

78.1 KB Created: 2021-09-01 20:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8df4c030a00909a07d40c9ffeb6de197 SHA-1: 306d7e543c5bcc32f1c8ac853f73a2d92e0c144a SHA-256: c88704355d1701482e5626d224fdca0a0c5fa01be60fb9f5f98f25e29bd25627
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised or disposable domains, a common tactic for phishing or distributing further malware. Heuristics indicate it functions as a link farm, with ClamAV identifying it as Pdf.Phishing.Trojan. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coretry.ru/uplcv?utm_term=introduction+to+biotechnology+ppt PDF link annotation
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/kenig.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/xegebaroloronebe.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/xivuriluj.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/daafb6d6bc243420c4523b64a2a7ba14/legasexorizos.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/66978772898.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/81104014133.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/92650442350.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3774c2b6c3---60058269402.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/83090712257.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/da722ef21a16e9ad3d037b0e295f8c30/97742491386.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160da32e889008---lirumuvibopigivisujurijiv.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/zukijutoguj.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/77507327640.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/7867af0b5156e4e1c5b9305c14caab18/23441071571.pdfIn PDF document text
    • https://giovannicaputoboutique.com/file/91595198363.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/21667579920.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/logekifudewobopudo.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/71543331910.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/ribat.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/67909747488.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079a46d711fb---60710802156.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be743babdc9---vuxagomawumajivarim.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/fojovejebumuzux.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/lalarivizifixamamig.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_off0000cd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD50 17288 bytes
SHA-256: 635a4155119828492489cafbae11a907c702ec129faaacaf872ba8af92ce3d1e
font_01_sfnt_off0000fa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001129d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129D 10768 bytes
SHA-256: 474393b28160b0135471bbd2804ca87fa2ab4de9df1d449e44db69e291c6fdd1

Open this report in the interactive analyzer, or submit your own file for analysis.