Malicious PDF — malware analysis report

Static analysis result for SHA-256 526853072f6b84bb…

MALICIOUS

PDF

86.4 KB Created: 2021-09-13 20:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1fb40b4e57102a39dbf0ea9a6bca29fb SHA-1: e988dc163fafa26765589f0b5c599fa0f7d9a000 SHA-256: 526853072f6b84bbb61f5ffa7e10ff571dbda7208418e790c523ac4134d29026
156 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, but the presence of numerous links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://viboot.com/ckfinder/userfiles/files/9319998675.pdf In PDF document text
    • https://adium.ru/userfiles/file/bekelabonat.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/d77c85c5966e67ff2fb4b12e0e07ba29/xepilateritujegudigari.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/99555561057.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/xotepirisi.pdfIn PDF document text
    • https://hoongnau.com/upload/files/soriw.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109012335285138.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613749489b68c---68463136466.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/waloja.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/sexerawowejafusalu.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021921758305902.pdfIn PDF document text
    • https://costarica4d.com/contents/files/61338399461.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/mozofuliduzanukalumikik.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/texakarupefoxafu.pdfIn PDF document text
    • http://toonesk.com/upload/sugozumuxefarabuv.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6188b177f---13209028626.pdfIn PDF document text
    • https://wmu24.ru/media/file/8193577969.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/nurulopomivinaxali.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/nofedirer.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/zotuvefosof.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/650008319.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/migomigezabofepe.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b11c77e31c---70168331069.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/bujoxajemewusekabovorizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=samsung+s6+lite+vs+ipad+air+4PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99D 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_01_sfnt_off0000df76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF788 21860 bytes
SHA-256: 9dacc95591fc5d7b3406357bbb7dc4c3b3326f6d606f2605c20274b40183b739
font_03_sfnt_off00012fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBB 11100 bytes
SHA-256: 44cdd4995b8739e178edbcd7a1cab376083c1606349b13de6412f8e500e0e921

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