Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f30cf4b41d8a8f…

MALICIOUS

PDF

87.2 KB Created: 2021-08-18 16:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d3b6e65d115dff02bfc221eeae3d57c6 SHA-1: d4d0b6909d9aefd6e8e0c4e7e7589dd30eb27304 SHA-256: d5f30cf4b41d8a8f113a15db9f45c7d2e1aa011e35eb288cafc92c80afd8fa29
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c14a15ffe---95702672462.pdf In PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/11f3407c252a89cba5c5006668bc5094/18432538224.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160804f557d943---fazus.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/3041408939.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/j4ndtqu95nmt2b9bdkup0mgldd/derapajaxeg.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/mp6igqpata7jjo58ou6to5i9p5/fitame.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/75888893051.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/xarifumumumeso.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/rgeml22b3c3g1sei46jgtnh4no/98348557435.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/39aa9a9d7854abd60c8cf2974e1789af/tiseduzeroputinuxuxurizam.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607580c297bcd---junifoxosigapinawogirep.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/88090305890.pdfIn PDF document text
    • http://trevorhannant.com/mijomiwat.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/dojijaborugig.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/zoduzekopawinegijon.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/nudef.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210715222749.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/57531133998.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/95145503082.pdfIn PDF document text
    • http://signauction.net/userfiles/file/65903627101.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/lubapogebarezikokakorilif.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9805c1290---57099213550.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/f40f3e2d2663b318f187d48c6b497f40/rodofexepaxom.pdfIn PDF document text
    • http://flexa.cz/docs/file/lekitomojevimalu.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4c48e1b30067616442b11d0bb9eb53d0/wateturazumuguguwedupesum.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bbed83330---pokerevo.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/rarulujoregowapikil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+build+my+own+murphy+bedPDF 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_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 10760 bytes
SHA-256: ecaa7ef944ad896afc3516be2f95372c52e50f74644a70dc715a438b02f9e85f
font_01_sfnt_off000108e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E0 17548 bytes
SHA-256: 9a625c0c2230997f60a5199c6fee6eb22b6493213eba5cc6a1d11ca7ad177d90
font_02_sfnt_off0001366a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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