Malicious PDF — malware analysis report

Static analysis result for SHA-256 b509377488430784…

MALICIOUS

PDF

86.5 KB Created: 2021-07-01 23:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36a34841ff89a407287b995dca7e637c SHA-1: 3e3a3c5eeb86fa00d27f30f55570d18b380e642b SHA-256: b509377488430784d23a10053c849dbf03cbfb7c996636ec5fc1d6481502376c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF structure indicate it's designed to redirect users to potentially harmful content, likely as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/af2626351bfced26739ab70729a1de80/88766709503.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/fifirovukinapewevasuka.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7824ba100c---fuvamiponisofiri.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2a23856e9---nufizowabaguforafalem.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160823b56203b3---69613616991.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce440fe3c44---tulepomadugidip.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee60f065b4---timinibawitozusotizata.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/180bcedf4e6636c268f983b9c48c919a/povirumozepofeba.pdf
    • https://emauto.lv/index/images/up/file/gesimitapit.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/3fea0e81330e4820ac2bfd1d5c081ea4/larokimimub.pdf
    • https://soalmatematik.com/userfiles/file/89318688792.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/evlirttn06e0qu5l6a1c2vifu7/26300124936.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608029273c795---xexof.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/zotikibetanimo.pdf
    • https://brod-plovdiv.com/images/voxobidalifalubi.pdf
    • https://noithatkuongthinh.com/uploads/files/vuxobuditirukebusem.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a3afbaab7---20940231401.pdf
    • http://asupuro.com/user_data/image//file/depusebopegoxiwodi.pdf
    • http://studiodabo.eu/userfiles/files/90374624632.pdf
    • https://ph2020.org/FCKeditor/file/16670364704.pdf
    • https://bawwabatrizq.com/userfiles/file/ridituluba.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7af25576a1---midojuvisiwinenubexodu.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831a1ae1658---dirogetixilebiz.pdf
    • http://stroisvias.ru/userfiles/file/4005435116.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/okjegk0f70412m02nl7m65ohg2/34275138308.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+make+your+body+alkaline+in+the+morning
    • 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_off0000eed6.bin
37c39f1ac18366fec7eebb550400fae00a3132ba01e8a2c8104272c36f618928
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 11052 bytes
font_01_sfnt_off00010815.bin
e174a9b5ce4f442d1b638aa27fb57b5f7943613cf011d95e22b4c2d03c1e1ae9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10815 17040 bytes
font_02_sfnt_off00013434.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13434 16792 bytes