Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae3dd1dba29021d…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 10:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 15eb68819cada0bf99c513fe03dbc2c7 SHA-1: 44f8f1ff2bb5043db43d7056643a36f6682ec2bc SHA-256: 3ae3dd1dba29021dbf829d2c699fc376f1622cb0c4611f927e4a1764f0a598f8
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage, 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 distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb80341924a---voratosalapiga.pdf In PDF document text
    • http://turatabor.hu/media/33458491276.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/79029923930.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16103414a69634---3634989148.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f24f54d013e---38045042164.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160927bd52fb99---73557339073.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/14331400858.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8f74027722efa874704cbb8bc4ee4c31/32744746227.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/55882445983.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/zoradore.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/lumakemazijobazugidonil.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/26738593294.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1610736a6e3193---48237921153.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/liforebufolutulegekeb.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/vagutowikadesobog.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087977b050a4---98824371395.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/nagarumuxojibemoxuv.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210813_13784A0E566AD33F.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/f7742437bffcaa86fc82cc64cf6155c6/pariwabedavemapidolapu.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/k5utdf89aruc3kk2ias78t3cev/nifonomejura.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/visofak.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/64538785479.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/lenomivejejabefaxutuzikim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=lubricants+catalogue+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_off0000cea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA0 10992 bytes
SHA-256: 3f17acdb93878672233280c541506fe77e577bb4d5ec05e0e0a057cdeb042765
font_01_sfnt_off0000e7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 18060 bytes
SHA-256: 8910dfd3f3f96ef7736bd0d90d78a1f54b02f54628e21b74a1be7e48d321c900