Malicious PDF — malware analysis report

Static analysis result for SHA-256 845d5bc8c6930560…

MALICIOUS

PDF

102.6 KB Created: 2021-07-24 08:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ccc72e50b4d76c3ae9d1773c153045b SHA-1: f7f3fed490be656a41261d4f2765b9981325d7c9 SHA-256: 845d5bc8c69305604ddb3985c9409f277f38445e48b67c431dbd302e9daeebaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosted on disposable or potentially compromised domains. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to exploit users by directing them to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://costabravas.com/uploads/localidades/files/foketina.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a3e04898c---81267205395.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/majbadenb2ae28r0t8cjo4ik23/goxeku.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2d25c9bf6---21242215162.pdf
    • http://bonfiremadigan.com/uploads/fckeditor/file/vakusoluximoxuxutututuju.pdf
    • http://bocghebinhduong.com/media/ftp/file/jadolufumonatabik.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7587b8e15a---89742734034.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609250c03d8cc---64408101166.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0640f26903---63682246991.pdf
    • http://all-pass.com/folder/editor/file/raguje.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b063f34d981---wenumaxele.pdf
    • http://baobianhkhang.com/upload/files/supilemopij.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/f18b83ea88b1797125d291737b001ba1/95660645166.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c34eabebee7---88991776375.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9602298e2---letiwodurem.pdf
    • http://confidenzacsapagy.hu/upload/47137439710.pdf
    • http://marcobernini.it/userfiles/files/sulixobivewut.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee370e84c4---jegad.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/d25ba43a8ab1a27ff1ad48da2de52723/sunenetikesawewenugo.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6bf855271d9536ca31d1e688efbd9aa6/wuruwenibavetalat.pdf
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/27203755418.pdf
    • http://archerelectricsupply.com/userfiles/file/tuxiterejoferu.pdf
    • http://www.tomasjelinek.com/img/pub/file/supuxeripuzupurivoligon.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6e863fdea---47218211143.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=causas+de+trombosis+venosa+profunda+pdf
    • 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_off00012896.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12896 16792 bytes
font_01_sfnt_off000140ad.bin
bf83cd4f3122ad37ebcd0f0ba4532feba3c9886b09aa24a90dd7f449c197cdc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x140AD 10952 bytes
font_02_sfnt_off000159e0.bin
08149d8e2bfb667a34f38795e7c7427556c1e33401f3ac4548b2189843629069
pdf-font-stream PDF embedded font (sfnt) at offset 0x159E0 18876 bytes