Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28a41f06ae8d39b…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 20:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0ac2d13cc7f1664dde9d78fd2d9f4812 SHA-1: 192cc592d78c99c2eb7b326bd3566611a9839477 SHA-256: b28a41f06ae8d39bc9db8809aef258d665251d9bbd05210e599de3f37bc3ab48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of multiple external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://rmp-traueranzeigen.de/cms/files/gowuzutewafumusi.pdf In PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b12014c165---jozojuzudojofapuganidakin.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/lre1t3c7sgohqkqk3lomdo1vlq/fafasojopud.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/26873bc1e2b5a4ea845d2227407fb750/vivukutuvozepopeduvowadaw.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/61006033057.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57bf3f058---pigixonurejipasixa.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ee9560e326a99894075f849e1ba3ad4d/60784708159.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/gobamuwuxawi.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/bf1eb11537fcab7020e6bfd9046081eb/59763290847.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/02t72et05n6urqe5lvhnb93df7/xopil.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d7696774d07a3fbab997a3b5b9010a3a/xagezotojudokakonev.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b06997897---wadovepopemaponij.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-8-30/20210830062421275018.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f453d6b5824---vokogiwovul.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/735a332cd13344cf88a65ff45ed03600/24075766927.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/bezagafidar.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec1fac1359---51577840272.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/1b1706f3197a43e341321e643f3f5368/40791025350.pdfIn PDF document text
    • http://aimic.com/userfiles/file/mitelokebuvejiduv.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/xulapikitegosojeketipeba.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/fv1cti4obppkej22ha3o62phhs/dotuwudikutuzezugun.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/59312465160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=network+programming+with+go+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_off0000cffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80C 17580 bytes
SHA-256: fe650519896631cebb9dd343a28499eff05a6e1762323112ac6d7d443c2453f0
font_02_sfnt_off000115a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A9 10888 bytes
SHA-256: f693caee4524fb31734639337a5346f1f6e8fd3af98a8c57027d35db3b211965

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