Malicious PDF — malware analysis report

Static analysis result for SHA-256 add82758aff0c9bc…

MALICIOUS

PDF

72.1 KB Created: 2021-09-27 17:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b40d7ca26876b0c250bb62876fead8a0 SHA-1: e8e5dd7427658f88a6f8f307989b040f0537024d SHA-256: add82758aff0c9bcd8f46e5af5885eae7baefa16b38838858fdb3c3461b2cad1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for obfuscating malicious links or initiating further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tucsokszekszard.hu/images/news/file/gotawixikomujanidexow.pdf In PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/vurufenof.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/bugunusefe.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/37749811337.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/dobadub.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/naxuse.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143934df0334---26513002048.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/8936d4b0b1d98499de16619f87970da1/vubefofadafazimumasiw.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210907190349.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/20139784247.pdfIn PDF document text
    • https://wrd13.com/force/file/44239545177.pdfIn PDF document text
    • http://kechengchem.com/upload/files/8785477138.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/sopimewegotu.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/93412097897.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/ramat.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/84191070141.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/25457958427.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/mimomenarovowivu.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/wonomepisaruziwutovitogod.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/gulirudogilakenaliziwitir.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/8116913341.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/5fc40b6ab58865719a35572b4b9c5ecd/gipubed.pdfIn PDF document text
    • https://theurbanthinktank.com/files/57967007759.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219121645406003.pdfIn PDF document text
    • https://invision.buzyhub.com/files/3559136422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=notes+app+without+adsPDF 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_off0000b555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB555 17284 bytes
SHA-256: 5129718ca4ea028c4bfd8ed5ef3acf44e166a6ef002d8e767bf7113fffd4fbdd
font_01_sfnt_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 10404 bytes
SHA-256: 1879afdc1e8724c76975fb234f545344a101cc9940cb9cbc1373e7a7a1413c0b

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