Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f58ae1ba87b96d0…

MALICIOUS

PDF

76.9 KB Created: 2021-09-05 22:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a96aa43944d69af79514db296b1c0624 SHA-1: d98defac5dbc779f950b7237a6148b5867314b00 SHA-256: 1f58ae1ba87b96d03444ece8267596602ce1794a7c2ef79e67313d5d7b58239a
176 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm and pointing to potentially compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links, such as http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbce31c3330---buxatajuxikonedukaxuf.pdf, likely lead to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afc59f780c2---70651585121.pdf In PDF document text
    • http://www.deep2001.com/images/library/File/69579340000.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/bokobalebefasos.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/43046926816.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cc7845e242---fofubidixakiginipa.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/nakevim.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/wavuxitasok.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/20553079591.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/pokujozeb.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbce31c3330---buxatajuxikonedukaxuf.pdfPDF link annotation
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/dfa8a39d36c5955f98d51007a2ca4cd6/doreku.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/ginelujosenuxuxilete.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607b000030060---47597303856.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/wubesutunipepeduves.pdfIn PDF document text
    • http://weddingceremoniesbybev.com/clients/72651/File/57259665994.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/53766437262.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/87177507477.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f72dfcc277---xixoge.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c37204c4d5d---76032571878.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/210654084660ab7d386482d.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/lupitapuwut.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021060612500065.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/titodapilo.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/337d0b6a8d632a71de0d066f756aeac1/8736024167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=m%C3%B6bel+martin+prospekt+pdfPDF 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_off0000c423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC423 11096 bytes
SHA-256: 67c58a39734f67b1614fe64bbdb343ce25cccef4b2a9c29865091f7ff24df57c
font_01_sfnt_off0000dd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 18480 bytes
SHA-256: f1a0b90eddd4722437ffa6cc8a3d786c705c953acb8ea4515a1520d4e0c2f401