Malicious PDF — malware analysis report

Static analysis result for SHA-256 43df25a083de573f…

MALICIOUS

PDF

82.3 KB Created: 2021-08-19 12:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8ee330d72f81d3ca444978d6fe410dbe SHA-1: 675a066658d0815e0c9370993ec2c68b78927b6a SHA-256: 43df25a083de573f56ee229767d071cf0316856cb0b111fb55ab086e797c7d88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs and link farm indicators suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. No scripts were extracted, but the PDF structure itself facilitates redirection to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=research+methods+in+the+social+sciences+frankfort+nachmias+pdf PDF link annotation
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b9dc92a21---10986031512.pdfIn PDF document text
    • https://schmitz.cz/res/file/kakivasawiresefidem.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe9c6687da---25797442718.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/52877744765.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/kukajixixubegiporutar.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c54dffe3cbb---fofugefulelenolanolor.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202108180620248527.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/kaliniduduwibu.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/xibupe.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/vumikefez.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607126c547453---37539137044.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/datadidejotamotuwozuk.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/zofomuwogijak.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/7f012a002cd96783a0a52534eda5667e/97156034956.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/aeed5effa61bd5c56533c75e55f36d92/wiwiw.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/91057018125.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210724144142.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/72613631589.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/99609232584.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/kuvepitajojonepuweg.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/78843602532.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/7330bec7e28b3b3e062d609af874c781/xanalunasujorutuliri.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/81630324232.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/15749089739.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/59369962659.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/76a589a89f463fb02cf47107cc093f4b/2862124050.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_off0000dbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 11020 bytes
SHA-256: 059dc1583a7d31c8909e83e284535da74df407a5fa6a369a9f1ea6cc036aa638
font_02_sfnt_off00010d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5D 17652 bytes
SHA-256: fd90145c597dd6725791a2c70f1fa4be866352f69054c00db8edb7781cfbd7ec

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