Malicious PDF — malware analysis report

Static analysis result for SHA-256 a996a6b79092d97a…

MALICIOUS

PDF

84.8 KB Created: 2021-07-02 12:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4f50a79abce6a9b3805714c388ab9593 SHA-1: e234ef8a142209f38d81787ae0323b959226c449 SHA-256: a996a6b79092d97a2312ce1e61df3d684657353ebfc4388d5ab29d7235ff626f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites, some hosted on disposable domains or using WordPress upload vulnerabilities. The embedded URLs suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://files.ibiza-ferien.de/file/bosusafu.pdf In PDF document text
    • http://aimic.com/userfiles/file/tijokefakuxokesajosavezo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072b13697cfa---40150917310.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/zikezubesozolomesuzoga.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/a2232bd69b9db1bc8e1fdc594c699583/rogapimuduxopule.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/genoxa.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ad5d3727---9045483102.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3fa6482b7---lewojopobetepifupixi.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079ed5c95666---ximodejapilorena.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/voradajajiv.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/limurafobekoxasuk.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/pepidabobijedaj.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cc130b92128---11199465198.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/xalotukujogowalezogadife.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/rsf3jkb2dfmkbvurvfqm0far7q/52661367993.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/pojigekaruw.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/tlo753k99baat52bott6q79mh4/nigavezelafezezoxevud.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606cedd9e4570---zapinixavajisudafosigi.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/nuluwuxefigigilode.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/70351040069.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609747780c236---kalobanapikujivemujizi.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607243ede941f---30720391366.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/8bddsqmb3ipsst18mpmhaorfi3/96677364432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=function+of+loose+fibrous+connective+tissuePDF 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_off0000e6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6ED 17812 bytes
SHA-256: d19ff01a796fa20c394186bda83c9a10f3b87f77c02c5d088b28bf5d23c2f7eb
font_01_sfnt_off000115e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF7 10452 bytes
SHA-256: 870f10dec62b34fec3a21df1db4660f31ee6de4fb38f7986cd2104b197fc7f45

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