Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d0a36b9d3e21a7…

MALICIOUS

PDF

84.4 KB Created: 2021-07-03 08:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91f129f4dd2e131d32080823f099596f SHA-1: 49b1f5150fc126a0bdd52b54fce2c716f1ef089d SHA-256: e5d0a36b9d3e21a7b2688d76f1ff65d2e44ae1d95041148cb4a910718762a500
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

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 http://supair-lux.hu/ckfinder/userfiles/files/pilebasokozag.pdf
    • https://finatwork.com/userfiles/file/zirafufuwanalenesade.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c7385aac9e7---mazororosepazire.pdf
    • http://popnmusic.fr/userfiles/file/zolakisikedagareripi.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609280f05c0bc---94500142132.pdf
    • http://hurtowniagrafit.pl/userfiles/file/81244938942.pdf
    • https://senhewood.com/d/files/sevijapef.pdf
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/jeriviluvanemoritoz.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1cc3e955b34fc5af7c3acf604131dae3/burolofamesapomera.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/4454175f462cc2cff486ab68f82ec533/pidasilevabemakilikaxik.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5180f2dd85---tanovovabipafekalevat.pdf
    • http://toptoptraining.ru/img/upload/file/59255150922.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/vemetawalulotape.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/ciglfdvub2iqvvomkf13g3rs9f/gomejukilafisope.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/aa22c75363c3de394c06e51736928caf/gutojivujikogukigen.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eac4ca6f7---bozajerusiwemiximopefuwe.pdf
    • http://bajcsidavidfoto.com/_user/file/poganibabo.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e6eee57c5---valopasefopuji.pdf
    • http://integrotech.com/zdjecia/file/laxetimozefalil.pdf
    • https://walkandsmile.com/userfiles/file/vajinajawenariligid.pdf
    • http://zabradli-znerezu.cz/userfiles/file/fefawelu.pdf
    • http://computerdoki.hu/user/file/33735575743.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcdfc51d6d---30030334464.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/s28941cn75kulj32o47has0phc/vivukefitex.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=2nd+in+charge
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e881.bin
921abe2a0c6ed66d2631b4f61d91d54a0b2c1050a91348f1a7a87e4b2641b50c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 10240 bytes
font_01_sfnt_off0000ff37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF37 16792 bytes
font_02_sfnt_off00011749.bin
a41ad8b2c25e8c5f15f925cb6fc69c7c455e51b1baa335e70ef64fb034751f32
pdf-font-stream PDF embedded font (sfnt) at offset 0x11749 17472 bytes