Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a78c7249bece9c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 03:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3ca9e0c9ef01dd643c69d53568fd20f SHA-1: 39a536b0ef53dd79303980067cff2b161fa86e28 SHA-256: 36a78c7249bece9c3a7a6163fd8f15fab13302ac987b2547fab228126072fb5d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://billsky.ee/files/file/1506463188.pdf In PDF document text
    • https://milosislandrooms.gr/userfiles/file/84799100487.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/saxegab.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2faec86e1---rokitokekafimaxuw.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/zuveniwavofekikijogibuv.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e76494731d---kagazaf.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/mefisalokobusijevodunazug.pdfIn PDF document text
    • https://rais.bg/uploads/file/15017493263.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/97121072840.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/8389431238.pdfIn PDF document text
    • https://citytrafik.nu/images/file/75912891078.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/lotojibowapobulevivotepi.pdfIn PDF document text
    • http://mayphatdienngocquang.com/media/ftp/file/91006519660.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/wefemilogi.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/64604764400.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161393549db273---57789825481.pdfIn PDF document text
    • http://chemsdano.com/upload/files/pubafowifuzilokigelanep.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/3121899589.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/75162430924.pdfIn PDF document text
    • https://coevent.ru/upload/files/31492137425.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109092129248599.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/61516606996.pdfIn PDF document text
    • https://mfdesign.hu/files/file/lofimawojulawozoj.pdfIn PDF document text
    • http://slovoveri.org/userfiles/1049072382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=benefits+of+ict+in+maths+teachingPDF 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_off0000dd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD40 18432 bytes
SHA-256: 7960f446419774a278525bb85c68ba40ac2669ca69907c33b5cba5950cc124da
font_01_sfnt_off00010c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12438 10688 bytes
SHA-256: c497c7084b201eeff18a7c8d4606d35699ae0cf0cfbf5b52a062b407fabf95f8