Malicious PDF — malware analysis report

Static analysis result for SHA-256 629717b66e0852f8…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 09:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b8f9b1bbef7d494485b23b339d5b2079 SHA-1: 517166f550da0f5dd9c319191ee82278d94b9f39 SHA-256: 629717b66e0852f814a0f0551a942b7e136d1ba9036c641e0c4d98ba0d8095b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious link farm designed to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/q09qs3u26s9im6i5hskht1mbc7/13147586675.pdf In PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0202095fc3---27007898229.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081c795ee2a7---61118119079.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160798e60afcd2---nezetilomunapajos.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/92e5135fcfddd026e15a1aeb2292a01f/45738803188.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/xadofe.pdfIn PDF document text
    • http://klenderbio.com/upload/files/88707258196.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/nco3eru17gv1i09ja98s98ielg/32669084649.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/kasabovamorise.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c8e24e7b48---58741755266.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/ronadenaxolaxagejubodadif.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a9db43cb4---36718950382.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/zawozegap.pdfIn PDF document text
    • http://ecole.ru/text/images/file/pidoru.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/vowonorozipevavuzukaboxo.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/zumelegotol.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/11137394294.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16085e2fe98ccd---7071860226.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/b66e7ea616679211088e4baa76f44110/nanumewokivuzotadis.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b671b63fbd---43517523450.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210603_195721.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/bd4d140f4217376005d94755c55f48cf/55224088977.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///kilibivameziwovalularera.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/fosawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=create+one+pdf+from+multiple+documentsPDF 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_off0000e2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C9 17900 bytes
SHA-256: bd84421c2d82502a6d257fd3947816526060b43b4a61ce4b1549e2419e3413c0
font_01_sfnt_off000110a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BD 10912 bytes
SHA-256: 19a9e22af5ce43c8a5ee98499a24e44c6f042ff1122d9162b932792e2326dcf0