Malicious PDF — malware analysis report

Static analysis result for SHA-256 104ab0ef71ca9894…

MALICIOUS

PDF

103.0 KB Created: 2021-08-10 23:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 26b87e6f6e5b3d1f67fc625b3e7a374c SHA-1: 9e5a4d02b4b4d63efe7f53c4cd5dcc45c099a541 SHA-256: 104ab0ef71ca98948cde67439ffce7768242dfe9cafa8b57317bf2db456b61b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9299

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://bjsteelvietnam.com/upload/fck/file/57965140948.pdf In PDF document text
    • http://duepassidalcentro.it/userfiles/files/51060229709.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b808c9a4---gilimojixumivomokurudeb.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bd3cae7d8---54888423055.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/ximetekiz.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7af6da453---nukumutufesidapilejagep.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/59116908222.pdfIn PDF document text
    • http://land89.com/ckupload/files/wiwigiwununaguvetuleko.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/wefid.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b772d569b07---sigoxobegoxara.pdfIn PDF document text
    • http://kaies.net/upfiles/file/wubajewod.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/nojavogejumosanerasolaj.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082228c5c0eb---lekefugadekekogag.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/evs0l1fstvc5pg9qn2p8h39u9o/25294851945.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607040534916f---99915631089.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/4008494626.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ab419a309---labudusupiniwusakiw.pdfIn PDF document text
    • http://juha.be/_files/file/81494993925.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/76841226793.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ldgus3scn6iu1qqg9fr5nt011c/21298096780.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771ca966d2c---tipeduwatetelobugatiz.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/95c5a0d8dbaf25e610337d489b7386e1/50423046994.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982d1ad1065---74723023007.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/ehpqphea9r55e8aib3fdbrsjd0/86101854205.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/hmurujivjoj50eh58gsgb5rvh6/kisenonefimupa.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f167b3635c---62339445929.pdfIn PDF document text
    • http://soupworld.de/upload/file/13421722514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+legit+check+yeezy+350+v2+bredPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10274 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34
font_01_sfnt_off00011826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11826 19580 bytes
SHA-256: d4ce78086f1ca8867feaf642666d7b648e98404cb23d316be1e1df6224ea0039
font_02_sfnt_off00014a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000162a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162A4 3752 bytes
SHA-256: 3b8a65d391c8b316bd6c38759c834a25fb2a52b1e467a175fbc771bff79d1543
font_04_sfnt_off000170b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170B5 11312 bytes
SHA-256: 6b011b2f189f626f5b0a7812950ac2a5b2556ee14eab702d325ccebfe26f2a4e

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