Malicious PDF — malware analysis report

Static analysis result for SHA-256 7de3b617ed2fc082…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 19:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00f4937dcc2b52b266f3a159e73a4deb SHA-1: 08b1e0ff822a0a36545614c052f1724d9a14c0fa SHA-256: 7de3b617ed2fc08213ad0d1dd6c57ae1a86e1845596f61ed804a35745d216bf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://homespakistan.net/magzine/uploadfiles/file/134840772.pdf In PDF document text
    • http://asoriofrio.org/ckfinder/userfiles/files/51529894727.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/12499203037.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/smn6at301ds667k7j1ivnj9kp1/sugogexoxopere.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210706_210031FA75C20BC3.pdfIn PDF document text
    • http://upakuika.com/img/file/dinaxodivumuvuniwigu.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f0566825d4a1446b7e058e4f06c558fa/jexaxekegifujakifilusuwul.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/sumoniretijex.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/97144819588.pdfIn PDF document text
    • https://mattress-leader.com/media/kizisumutufatitef.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/gexawaxaxulibexunal.pdfIn PDF document text
    • https://proxus.nl/file/19249937651.pdfIn PDF document text
    • http://beateromer.com/bilder/file/43446747443.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612505bb25e3c.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/webidugefoxunigaxi.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/98679081251.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/nunojunutimuzijugiki.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16121b53067bc1---vafukeritetalipu.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/2512f50d6600ccdc42334bb4d99ea779/72714156210.pdfIn PDF document text
    • http://sjhtractor.com/d/files/vinepadijoxotibujal.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/efcc0218fac79da97d7d3737651c0654/siwiturewenetobaxuwexa.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/88976084428.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa985092fdc---pudosuwonuvolizoturi.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1af3c6cfddf93b5d2d6c84623fb52b76/73554447303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=islamic+epistemology+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_off0000da08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA08 10824 bytes
SHA-256: 1a4289e350fb185b2bcb82f2356b11b8d30d3c35e1bb158e8b97bebefadc24bb
font_01_sfnt_off0000f2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D3 20396 bytes
SHA-256: 5c21c6dfec88f7badabe4dbf330ec65e178a36af3a0f0f28acbb375d8e22faaa
font_02_sfnt_off000128d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1