Malicious PDF — malware analysis report

Static analysis result for SHA-256 85505682d472f674…

MALICIOUS

PDF

86.7 KB Created: 2021-08-10 05:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 55be710e151eea3f4682fcd81c53ef48 SHA-1: b5df54f712b5c6266382a5fd04180e81d9feef49 SHA-256: 85505682d472f67415634dad014c3c36f57da9189fb189cede29b244fe8ebbd6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure 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://yourhealthyanswer.com/ckfinder/userfiles/files/68001537897.pdf In PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b770206cb22---62637690003.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608886a5865a6---10659027381.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/ba784f40a0c811eb22535d70938c3d62/70188814804.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/bifusolalenufowenan.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9047e6b95---tuwesilireta.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/i8gceosnjc5moqd9m8o6hujqq3/5499388157.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/18212091600.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082ef1b12f30---jupibipemumike.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/roganososovivoxuk.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/71795521709.pdfIn PDF document text
    • http://apvn.info/userfiles/file/79858747094.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/43699725059.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/950bd3ffc673069de267e3621a30fc00/pobun.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/15737733924.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6747291869f56bca16a93ccce9934048/4004618564.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/860c9c24929e70dd00b66f0d13042df5/jikoruzi.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080da05da958---poromesimafutadovizomud.pdfIn PDF document text
    • http://allasclub.com/campannas/file/fofipowomajafuwamibixa.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ccf1debfee2859320fef1cb0da1a7a88/xemesubumajadamurakoja.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/zerilakumufowaxiwawirad.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/idm65d80bjie62fn95bhoo01mi/40566183482.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/42198963903.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c29d0b58d7a---jabiloxaxe.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/tetefasefuberafolat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+get+and+link+free+virtual+credit+card+for+paypal+to+verifyPDF 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_off0000eb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2B 11076 bytes
SHA-256: 1a48c2661a64f102041f691dd590318e3e855bf998748533b79b256f69639a5a
font_01_sfnt_off000104e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E7 17172 bytes
SHA-256: d164d9abe4e35bdf86489cc664f7c323ee9eaf358b83f5a1cc7484f4f90b35ee
font_02_sfnt_off0001320e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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