Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee91fcadc7857e38…

MALICIOUS

PDF

120.2 KB Created: 2021-09-04 00:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27dedc534e14f59b6616fa72e399c315 SHA-1: e2bb268134f302bdb41f9693e99dc034a0d46971 SHA-256: ee91fcadc7857e38892e0a6e400f7b8defd57b1ba60280b1f00c478f4c20a158
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of links pointing to various domains, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these link farms. No scripts were extracted, but the structure suggests a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c96fe7e36b4---rijibufisexalomutafetezen.pdf In PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c284d6928db---jugelurozulewenaninuvevu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0539c32cbb---56913525783.pdfIn PDF document text
    • http://gibson100.com/clients/870224/File/56941097713.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210624_045826.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/040a712d3c0fe7524b14253ee778cfe7/72926721356.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160710dc576622---zisilumutew.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/lomuraxetit.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/1b37f4ebded64f9caa6ea8ac9ff593c3/79013276454.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/88d5a70a25a108ff6810a6654d3a5ba2/bifudukob.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328a765526d---gazowuzuwivep.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/veribusuvafebijofukuwasi.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/jafagasoroturapotebaw.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2f81be3c6---wivobofebelukiwixavar.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/69356032221.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/3326858532.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/vikugajafepigurowikubum.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/jojarodiroxakemavom.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/latizafizi.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/80936225172.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/55511605471.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105bc08c0cc8---nenemixewuzikataboxif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=delonghi+pinguino+heater+manualPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/zepudibikaporogutovarim.pdfIn PDF document text
    • 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_off0001457a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1457A 25056 bytes
SHA-256: 6070ccf87f1dadab7a4fc26046eb3ba71c7e57c433a21f44841bc3f3f8365d21
font_01_sfnt_off00018259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18259 16284 bytes
SHA-256: fde65c8cb77ea83157e3d1502ad2aee58f9d3905ec9a641983701f347f9e5115
font_02_sfnt_off00019886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19886 10632 bytes
SHA-256: c10873772d0f9cc83594d031eea2c4ecd22ae675ee3115e97efa5d7be83e6a1a
font_03_sfnt_off0001b09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B09D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001c8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8AA 2076 bytes
SHA-256: 3cc8a62c510cf61b6e0b78164b43afbfa54ec56cb882c6a341d2014e17d809fb

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