Malicious PDF — malware analysis report

Static analysis result for SHA-256 629f5ccb98221ead…

MALICIOUS

PDF

79.4 KB Created: 2021-09-04 11:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f244d30d944d15f53a5a7c99aee60fb SHA-1: 2be5acb04b38822cf6278840265cd2ae1440f107 SHA-256: 629f5ccb98221ead506c3250f294b3588fc1c0a8438361ce1977ee00755ac3f4
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple distinct hosts and the use of compromised CMS upload directories strongly suggest a malicious intent to lure victims through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/fcf9164e063f68db7e38fb1936cefca1/libetofetozaf.pdf In PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/73im7l9npgg21q20begug8l11p/27298701100.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/kajoforokov.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a7b660e5c1d60fcaac21c2ed9dac855a/rajofutegibitomijatepuxov.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/143bafec72a3eacb7b3632d114b4ac9a/getupi.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/74712359326.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80004160800.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/kigigojixitakipirivuxibet.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/62625658147.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/lunito.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0f9a1a712---kaxexalumigelupu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4da26476bc---xawudegobobibasezozem.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082040f0f8ad---bujitegapazu.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610041abd9220---99200723734.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/13471266641.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/zikajemebawaropa.pdfIn PDF document text
    • http://195exim.com/datas/files/75606907232.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/66055269529.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/44111894522.pdfIn PDF document text
    • http://email-database.info/userfiles/file/guxasedowujetulitijitavil.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/82e7aa7bd166a167a756bb0836ac5d86/84715514586.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116c117c7ce0---24437120715.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/49704245238.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/37783705351.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/jivufipunerofup.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/39978007874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=m+sound+worksheetsPDF 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_off0000d270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD270 10316 bytes
SHA-256: 9c4d8cec08894772b7f7a5211785055943701810c7fc3ec713962651c554fea0
font_01_sfnt_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 18160 bytes
SHA-256: 2419e8cb16fb27e4de1306657dd76524a69db9225c8e3f6b013926adc5af05df
font_02_sfnt_off0001187a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1