Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8d9ebffd4d1450…

MALICIOUS

PDF

84.2 KB Created: 2021-06-28 06:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0db3697d8b244f8805ccd440182f8d63 SHA-1: 89b4659509e922ee22ac3115b973feaf193b328d SHA-256: 1a8d9ebffd4d145073d292d9ae8465aaaa776ade3854633d6341d295d145bd43
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://digireg.nz/upload/sutafajuriz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b5300c9e5---sefibep.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d200a9ede68---95427972726.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/zagizijoxotekunenelemoneb.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/02a2957a3abfb26c926f9ecee329609b/16583355500.pdf
    • http://www.bandungmesin.com/file/vavifapof.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/f71b455c9bb2d1c5d79a356fe45f50e3/64518916693.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d4cf87b07---72350551618.pdf
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/72502468153.pdf
    • https://samarpanbharat.org/trila/userfiles/file/jusaj.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca91ae0d7d---52660658024.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2c2370593fc6126fe2bf9e397b82007a/29491990929.pdf
    • http://clinicaveterinariagussago.com/userfiles/files/10571829822.pdf
    • http://investin-khj.ir/ckfinder/userfiles/files/denusopofego.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e409aa222---64694900904.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160aea6544d9bd---90446442510.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/71eb739fc7672628ea34471176acdc46/pirejexumode.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d63d9d79d---godifaxorogorijifik.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/8ol90slqh9dije2ren4banird4/dikumuz.pdf
    • https://angkortaxiservice.com/userfiles/file/vunudasopebotoga.pdf
    • https://muratay.nl/userfiles/file/13600752732.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/g2regjk9dc8oiq6s1cl56lq8ae/93747510816.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609acd8ea97f8---lijimalofar.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c64ece6b7a---nowibeweligexog.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=marine+corp+drill+and+ceremonies+manual
    • 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_off0000e889.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE889 16792 bytes
font_01_sfnt_off0001009b.bin
26c1ab434f4562a1733692340df35f633f31d3c7f5b47d0b40cf7e116a59a9bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1009B 16396 bytes
font_02_sfnt_off00012b27.bin
0b45505ec2ac48b84237a165ad19f4ebb41bd010d0020ca442fa2b659546eddd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B27 10672 bytes