Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d33b26b7c1709a…

MALICIOUS

PDF

73.1 KB Created: 2021-09-26 05:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 999c10d767d79308bbbf79388058d366 SHA-1: 5a76f0e5f94921bf9a45e7055d4226d10b079a9d SHA-256: b2d33b26b7c1709a2f694eb7bf668dd8f9f65b8ce6208ad0da96d3cf6b812e90
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://deforma.it/userfiles/files/80631416898.pdf In PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c8fcf2dba---gufizivekuru.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/wukasumidikamuvoxut.pdfIn PDF document text
    • http://checopharma.com/upload/files/90006483115.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///desebisajebupe.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/2419273248.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/91152d39be610b04a97f853d2ec11d3f/norud.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1df729d28---54464293190.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/60057530311.pdfIn PDF document text
    • http://csc0871.com/userfiles/file/20210917005722_gl3oww.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/joxanefa.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/61c45c9ed97b0aa2ae500ef8fe4025bb/mimebewojorulidab.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/73815888351.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/410533143e774b04accb251058b0b567/xogulafatuzabenog.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210922235004.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/baxix.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mutegukakilovefolokegi.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/10900135651.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144fb5a5e329---74661447040.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/sudibepidoki.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/94048966658.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/kofitum.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/zawolidebamirazoxuvofidiw.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/43125157083.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb275122f1---56691460505.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/suzelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=phoenix+os+android+x86+isoPDF 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_off0000b5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B8 10680 bytes
SHA-256: 6af1de53398344c56d733a49760a23c219f04d23e554327261d5a8bb1c067a2e
font_01_sfnt_off0000ce25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE25 18312 bytes
SHA-256: 3b4192bdb9f05e0fdce9265b4aacd29253cccda6358d271a68d454b6c8e44aba
font_02_sfnt_off0000fd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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