Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef657802052962cd…

MALICIOUS

PDF

88.2 KB Created: 2021-09-15 16:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2ba59e00f625331212f391d6d96fe0d9 SHA-1: 3437747f8b326f3932825871d7bf7fbee2a7977b SHA-256: ef657802052962cdbfacf1034d754dddd27f120e08b4e4f3b2a64c4739e473fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of multiple external URIs and link farms suggests an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

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://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136f84ab27ec---nijogeredirujovituwejakax.pdf In PDF document text
    • http://vonschickenconcord.com/uploads/files/vubito.pdfIn PDF document text
    • http://etkenkalip.com/files/kejakebutejibituzuxuz.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/8cohlkja9lm9ectfsalgsu8ks6/18909947579.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/87069214417.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/51475233058.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/luvodajuw.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210906_9A8467195072E469.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d7a3c16c9---38361889456.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/gejubapiwajemiz.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/25573440222.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/wodazun.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/67130246829.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6b6b84123---zupukila.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/18546198523.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/desajo.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090617504373499.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/4872422661.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/962618955.pdfIn PDF document text
    • http://regmac.net/userfiles/files/fewufapefazan.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/vorijezajosapodebi.pdfIn PDF document text
    • http://gapp.fr/medias/files/31645719500.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/nopopubojizaxalobuj.pdfIn PDF document text
    • http://parfumland.sk/upl/rudujebuniwavofarudif.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/tesukivabuvafotopu.pdfIn PDF document text
    • http://ihdbd.org/upload/files/54067199093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=adobe+after+effects+free+download+full+version+crackPDF 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_off0000e4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 10936 bytes
SHA-256: feb6bd33ec9bbb033a26e392a79e9a7a6be71af04055acf112713d177921762e
font_02_sfnt_off00011644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11644 18648 bytes
SHA-256: 03435e14cd799d34e7496cce349a1b45394d2b47659718f6bd486842d62c050d
font_03_sfnt_off000146b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B5 2592 bytes
SHA-256: faca1adaa85fa9127c62d2c99ab92ab118553287185db414dcfd9363f67e1936