Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62e21c0f80bc6ff…

MALICIOUS

PDF

74.4 KB Created: 2021-10-14 05:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b5f40d921a4e626d76b86d91690a7137 SHA-1: 0ebea6d75db7fdbc847abf1480f9d6b470b74b61 SHA-256: b62e21c0f80bc6ff4dadff9f1ff481360986c77e6183d6f484a8652dd830f669
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. No scripts were extracted, but the presence of numerous URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://momentous-inst.com/uploads/image/files/junajisikivejofonapetiz.pdf In PDF document text
    • http://boschvietnam.com/files/usersfiles/files/xataziwikumerafuxu.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/vkiv0khrkp3qhbir66tilfvcsf/22257062960.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/subalasekuvimobakotisaxu.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/87303731434.pdfIn PDF document text
    • http://uhorder.com/upload/files/88376038849.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/60035752343.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/juregoturexolavoke.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/516872162.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/depanenaxozavilekavodum.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/9616df9382c0508f414efef41f2b4cee/44058842893.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/40iooku9km0bv3c768m628k8ff/nevidekisuwovibavox.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/kozirazijaleker.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/jinibedosuzomevo.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021101022305543496.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/22985744362.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/lixerokekowuvesatamedof.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/debapagarekirekatiba.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/vajukarataruzerafifa.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/38365982630.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/kazetup.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/3b2fcba6c2729a9a8623f46f0420b1c8/36758625582.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210903_C9D5303BA59E4C94.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/sifomebamujufiresu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/1hHberoKktI/uplcv?utm_term=sm+fairview+to+sm+northPDF 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_off0000be26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE26 17604 bytes
SHA-256: 6b809271141e151e0ac46e31ff6c4aacb8d95fda262189084e47542b321c1d99
font_01_sfnt_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 10660 bytes
SHA-256: 4435f613ad5c55e98ed42c3223addfe2974ec108ce4ddfa03cb040fa67e0ae13
font_02_sfnt_off0001042e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1