Malicious PDF — malware analysis report

Static analysis result for SHA-256 706f9d510e38e589…

MALICIOUS

PDF

83.6 KB Created: 2021-09-15 17:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fb9a3d0d3d82b3012312c1a8b1836f19 SHA-1: 6ba91166ce97587b0a515c4951766aabc9ae7f56 SHA-256: 706f9d510e38e589964d3762e43b320bcbced5b1f315f7332ab6802baffc62eb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to multiple disposable hosting sites, likely intended to obscure the true destination of a malicious payload. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document's purpose is to trick the user into downloading an encrypted archive, which is often used to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://remont-elektro.eu/archiv/file/57566211296.pdf In PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/72159442781.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210913_5711492A567A11E4.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/sugutaxafapilex.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///banusozenosofajevij.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613147fa510a1---1114071473.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab6d77ea43---risagofeworaz.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/61948883381.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/53154119510.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/9289909199.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/puwunulega.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/dejokuvunus.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/komisuwugisizanelizavabew.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/tafusopujudumikadakev.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/4567486096.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/xebiv.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/fofosape.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613620d6de105---toxufolelalubabajaw.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141675a8a1bd---xadizawodutixelimadopilil.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140cc7378ad3---39012575473.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/93146437284.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613d1b851c90d.pdfIn PDF document text
    • https://10fci.org/userfiles/file/71462896613.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/54783613295.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/23d765cf0a3716971cbd95668bd96b33/wigixosorupagemosini.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/19250906986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=forgot+draw+pattern+to+unlockPDF link annotation
    • 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_off0000e1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C9 10684 bytes
SHA-256: 8e6e53f70f0c430947e43a7c25a100f76b4cc869293cbc88aa949a4765c5bad2
font_01_sfnt_off0000fa41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 17964 bytes
SHA-256: 553e37a2b4b20a5cb5135c5deaf419203797784427ece7f8dc3b2d19747ddca7
font_02_sfnt_off000128a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1