Malicious PDF — malware analysis report

Static analysis result for SHA-256 639d8116f433709b…

MALICIOUS

PDF

79.9 KB Created: 2021-09-20 01:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0cf331d1437a6a152dda26fda9075b1b SHA-1: 903a705f3e362f543365eff52339957d18bc2be2 SHA-256: 639d8116f433709b80f14a5da49cd37ddfac0e764ef6774586de8cbd5593a8d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the nature of the URLs and the detection as a Trojan indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=how+do+i+delete+an+email+address+from+my+phone PDF link annotation
    • http://stoka-saarlouis.de/userfiles/file/xowarage.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/zolapi.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///nezadubimumexufuf.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/rajamafujamirumaf.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c94ae04977---sibalox.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c507922a9---kadujibirigurunogawovegi.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/wopudizabekadesitapu.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d364330134---40394191881.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/78274514766.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/25423679168.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/sulubi.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/29781539252.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/fisudokuvin.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/zufadoribigutisejigikos.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133eaec7993a---86690850460.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/dizajosuzegabugonewujof.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/wiligamexuxatisu.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/77928891975.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/rofudasobivu.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/78209538901.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/45625223187.pdfIn PDF document text
    • http://newcityhk.com/userfiles/xuzugibemidep.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/69783758629.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/72911260840.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 17552 bytes
SHA-256: 6faf367428149b8cbf3564760d937e4001cb65d8f7467bbe1a3b5a9aaee55c0e
font_02_sfnt_off000118cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CF 10952 bytes
SHA-256: 49eaf42d4d00e6e1a5821af12bd48267bece02e40e19ebc5535a6f02ad53843e

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