Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b547cb78a79724c…

MALICIOUS

PDF

89.7 KB Created: 2021-07-17 02:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7784e4695c3fd512aec10ae709df84f7 SHA-1: 9b812b71d7a2a1d5a5fd2fe6c4ecae0a73a65403 SHA-256: 1b547cb78a79724c8021b5b07143a5953e1709897446d7e14f07b994cc146e3d
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting domains. This behavior is characteristic of a link farm designed to manipulate search engine results or to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

Heuristics 6

  • 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 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://beautyyaurient.com/editor_upload/file/gelepujimuri.pdf In PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/79tjtne7qm22r3q4h5cmfpcjq2/gofowapuzadutudezebuk.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/63821301225.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/08889b3c5676984155749845f800000c/40048917222.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/87284844444.pdfIn PDF document text
    • http://elm3rad.com/file/29155938492.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/fefebobewowulawexejitage.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/61553756608.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/rg1ch277kr5fosjmo37528ka12/34092160217.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17680569b6---gunenatorejafozatuxurex.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/bapex.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/nofawurafezivazamikiv.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b115b89f2944a91e1d11612d4f0dd985/97888058299.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f1ffaebc7b4b79ef32b85450bfd89d7f/2025759471.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89bcd995f---kimefuferet.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1da3b07ae5---58062436172.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/wezapasefejetixuzerox.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/9lecdrsbgga514d3lg78c5okrr/nitenabirojadafaviwoz.pdfIn PDF document text
    • https://alutat.com/data/file/59275548087.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160784dfb9727a---83964128374.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/6341d161b1338192994c0310a0cff6fa/figedozidoveguwebala.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/4avai5lkdeu4o42fid4m7ucnr3/31063530585.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4c283ace0---33584818308.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fb45568cd---lepukekeralad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=laude+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EA 10264 bytes
SHA-256: ac5ae8d14f92cc7c5c86f67f5bc1f086a1ef8f94ac77003a6276644643a72ead
font_01_sfnt_off0000e796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE796 16656 bytes
SHA-256: 3c116d3453dac5446c1b5be22a53ee65dd5f43488daab24e82f5044138268f26
font_02_sfnt_off0000fef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11701 2628 bytes
SHA-256: 44c38c761abbcb146f6bc2080ec36f86818e13fabc1b93356438f081dde5f87a
font_04_sfnt_off0001221a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221A 22120 bytes
SHA-256: c23da80c0017c983495edfd8ec223e25757f5b43e708fa791669c58b85683444

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