Malicious PDF — malware analysis report

Static analysis result for SHA-256 068fb3295552048f…

MALICIOUS

PDF

94.1 KB Created: 2021-09-06 18:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2bcd68993d4b34df8e1c00b95b711be1 SHA-1: 841dd45e88910c36a36aae6e32b61cca9d5ddadb SHA-256: 068fb3295552048ffb3abab799f5d957a7f29c78b68574eee1b1212a164a76b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://northcoteplaza.com/userfiles/file/71176526727.pdf In PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a731e1a5c6---fuvigo.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e224e7d211---nizeligatude.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4d5927d6f---xigatozepiwazosisufo.pdfIn PDF document text
    • http://cedarvalekansas.com/clients/875954/File/88941055456.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/n45iaiqmdu4a7j7ehpbp6f13c2/nezaretig.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/59049406370.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/82388574106.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/matijonovinese.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/36779747408.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/68126166119.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a99f654317---giweweso.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d983d17e7---xopikumurovigesedo.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/u26hlgnubb9niqrgjhjiub9et2/pokuwiritodavogaxi.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/60161736838.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/53750929654.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/p8v7vob5tgabb4h6982e70c4c8/jubirisisatoteroku.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/vodevogemalikezafizef.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/jowegubofir.pdfIn PDF document text
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/99908916663.pdfIn PDF document text
    • http://gotween.com/userfiles/file///juroboludapovufuvoji.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/02a3526fb57a7f26fedf9508aac7ee3e/kaketodubegozupudosip.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/24798672019.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/0ef9bfdadc8a62d291a597cd2f1ec751/wewibomobozorogi.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/26875987830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=makkar+cue+card+pdf+may+to+august+2019+downloadPDF 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_off00010b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 11716 bytes
SHA-256: 6fa30701a120fc7186a17ba7c94945ee59fafaa85b242c78f50394d268557ca6
font_01_sfnt_off0001275f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275F 16660 bytes
SHA-256: 0d8ae49c9eeec69e1954d96a0b736d174930a6a26a29079a5685fbe542ad9d0c
font_02_sfnt_off00015237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1