Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8c57c2e4559137…

MALICIOUS

PDF

86.8 KB Created: 2021-07-14 02:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1d1c0109b533725734c21e4ae0459135 SHA-1: 03315e1bf089f95fec02024431297d8388948519 SHA-256: be8c57c2e4559137db9a42924fbe433a7c9981c5462ca82d0a9fb5817359a582
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The embedded URLs and link farm structure indicate a phishing or malware distribution attempt, leveraging compromised WordPress sites. No scripts were extracted, but the overall structure and URL patterns strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://laborke.ru/uplcv?utm_term=does+red+and+blue+make+green PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9227b9dff9---vezaxisopixarave.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082c11dbe43a---29241221944.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/8293c934fb8af38c85fc137c9212ad2d/sunesufipe.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/fivogagonulutojajuba.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c9b7c5da---63522043150.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ajafibian7r8qk6hafgqjfnsj3/pokivuvidetu.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/4992337815.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecf990e29b---lelum.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/lupapimibugulagude.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/g7p7eeqbsa6ia3en5ujkenhvgl/56126649656.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/5446b4aac5a587d0443a96210162e95e/lepepijax.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/kakejojadixonosexofum.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/87077011026.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9800f2bae3---wimogezo.pdfIn PDF document text
    • http://beiks.info/public/file/zitamexazijirigabe.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f338c4def---6807254347.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608512507736c---ronopitapolusibu.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c516730268---piliwefogipefijokudazitud.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/podoxejilomite.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/d1c9e8bfed8ed51d59361b549adf0cca/xalubev.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/p8v7vob5tgabb4h6982e70c4c8/jubirisisatoteroku.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a8ea9e3179fbe314ee8ed86a247be422/56545190270.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/monaveluki.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/2fa1eb4ba9100ee0960add6972dc97de/rabilewilaned.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3oqjd4vl9ud0nnm6nssamvch6f/98592056926.pdfIn PDF document text
    • http://abnicum.com/files/file/tibujetadatesifofabosifa.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_off0000eeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 17236 bytes
SHA-256: bd898c7bd3f59cd137cf2c3b103e76e1b37697173239625b138b93eb628228ca
font_01_sfnt_off00011bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC1 10736 bytes
SHA-256: 6ff06532065363a7acb2eeca8e192cb82c72c34872ed1821e89be67bcb3c6f59
font_02_sfnt_off0001342a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1