Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd7dcc1b34c1dcf…

MALICIOUS

PDF

113.8 KB Created: 2021-09-02 22:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ced2335906283ef82e7209f1ac7575a SHA-1: 9cd7f792fa0ac0acc8ae261b85c85e430c839508 SHA-256: 8cd7dcc1b34c1dcf5ee842ac951d1b10e9fc0ff3d3df605be531d29822ea9cef
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised websites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristic firings and numerous extracted URLs suggest a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://alate.org/admin/fckeditor/editorfile/30410844672.pdf In PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607df80b28b67---jeroropopadedisosexuget.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/3533623675.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/volevowowogowotido.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160949dde5c432---99891169286.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/dijusigazixugadagovonuger.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611e4c4ee092e---gusipasabudubetak.pdfIn PDF document text
    • http://araonline.hu/uploads/file/tipagudasavosamura.pdfIn PDF document text
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/dinugaletediruzaka.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/upr9eqgqsblmrd5u4gq6foeqm9/suxamebikufuz.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/7e2f97f387429759079bbcf67ca9e066/masugazuf.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16077741a85cb0---4861869336.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/47e90f2a00637f5c5cb62d495c2606e0/donexedawutagazonufawe.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/7093022435.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/8954810538.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fb8995a7069---64171541987.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/dotopidosinujemoxu.pdfIn PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/wisomororanesif.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a556f388309---76767308272.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920f1279059---88906739186.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/mazowetoregojuwopiguz.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097b99f7456c---82899583728.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/34504299673.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/sgtmfg76s3qjqsn4r1ig5itcb2/xelagepegumad.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/46258430384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=yoga+sutras+english+pdfPDF 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_off0001576f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1576F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F86 10860 bytes
SHA-256: d7e59bb09c7a1a0b79d2a0b9386eef6217072f8c0e9c587aad2d338cee9b4557
font_02_sfnt_off00018851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18851 19152 bytes
SHA-256: dba901a30888cb17433a607000615a2cb93362f3c57dcbeeec5ecc966a646448