Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb2d136ded3a7db…

MALICIOUS

PDF

74.6 KB Created: 2021-09-05 07:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7682eee1234ebd3aff50b88535dc76ad SHA-1: 9b513421c78fc06317f276660b62994347b57dcf SHA-256: fcb2d136ded3a7dbc31d8a0ea5e0668a01a941d8db33258537f2d34540c3747e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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 http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f3a28daa18ed01051be9616d3def07d3/30884239690.pdf In PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40766636823.pdfIn PDF document text
    • http://sdes.in/uploads/balixeloxumufotada.pdfIn PDF document text
    • http://poorclarescork.ie/images/29612792133.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607395a1b9a2c---55337143146.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/ridodijuz.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/htl839cd5fg5e4qjhfcianalo2/30739118641.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/f35h136eoj67cus6on3nlfo251/vemesakovuraxatef.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56dec3413b---sunasopimisevuxonipuxa.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/66828394900.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/cjr3n42te59u8ela686cv1l8ct/46592735769.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/nonolosizidan.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160991d98bb27b---jebemi.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/purazoxexanobetu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ee04281ef---89001358503.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/malazumakukivodaf.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/26484019409.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2844233f---kukokulavori.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/venexitonexuzifukeku.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160fcbd6565901---80514218596.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/kiziroveb.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/65030174415.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/2h73tff9l1ne5uhmj2kpo7558j/40605328886.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/71190410837.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/zixej.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/5noh6j6q4iu5d33coqejhsb8t0/46408294430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=punctuating+dialogue+worksheet+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_off0000c29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29D 11176 bytes
SHA-256: 8cdb1f4618eb3bcaff0527393f3d5b6cfbc75763ece41bd455cb8743b50cf18d
font_01_sfnt_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 15472 bytes
SHA-256: 590e0ae50dca6335060a821ebb91b572dc4aa0d11d38477f9d5854814f67d778
font_02_sfnt_off0001044f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1