Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c228d796faa7c0…

MALICIOUS

PDF

85.9 KB Created: 2021-09-12 21:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 744d6865cde5b465132831cf82fc6e3c SHA-1: 8b339b11387a4f9163bfd7efa69085927148615c SHA-256: 38c228d796faa7c0e5ca272681b3c624a190c0224727299dd5bbb03c6bd40d78
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aksaaydinlatma.com/img/editor/image/file/rizenewipidoge.pdf In PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161399320ddbc5---5541555965.pdfIn PDF document text
    • http://fgosvo.ru/files/files/woxujuduveborupes.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/jimeziv.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/rosesosovavenekozosurum.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/52124241578.pdfIn PDF document text
    • http://happy-land.hu/editor_up/52660712766.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/72290243515.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/44455311358.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/83668808781.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/c3edb91f477e8c121fbb5b71454bd452/79615652826.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613db9eac723a---sisegipit.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/4bafe1980ba693f6d7af108fe2b94831/dulosixonudisuge.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/82781367145.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/18508722792.pdfIn PDF document text
    • http://newshop.jp/archive/file/57120312779.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/besewiguferonireleroxip.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/nofofazefusamewawefose.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://krukaiart.com/userfiles/files/57001408772.pdfIn PDF document text
    • https://vzglavniki.net/data/file/xubigemumovigareduraweto.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376f7089a1a---16736570021.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/nokavevufikajivurenazamot.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/22091434741.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/26076009807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=android+phone+layout+ideasPDF 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_off0000eb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2E 10684 bytes
SHA-256: 0303771a3b5a16bd4ff97a90d1060f7937c9501535a3d6393ed54e2564a1df71
font_01_sfnt_off000103a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB5 17620 bytes
SHA-256: a0be304b68d06ecba383d7aa04adb002a6f84f278ae109422be752269d17ac72