Malicious PDF — malware analysis report

Static analysis result for SHA-256 1946ff1b20c5a861…

MALICIOUS

PDF

100.0 KB Created: 2021-07-07 06:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9bd583b0114ee7e442b42d2de923fdf SHA-1: 431f8225a368d864d247fe18abd71ecbb0c30c05 SHA-256: 1946ff1b20c5a861a82fd03e5ac1efea43870bb6ac8093cbff7a7ee013835e1e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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://huntic.ru/uplcv?utm_term=extraocular+muscles+ppt
    • http://terezmisszio.eu/files/file/wuwagagoforinokobam.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/e2e90a6909c1d1d93bcf416060e2a599/janowavubatolapodujewu.pdf
    • https://ndmoyun.com/calisma2/files/uploads/sejakulafa.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b417837752caf11d23032cee8d028154/40338134740.pdf
    • http://abovomedia.hu/_user/file/67008535786.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733a13f3df8---gakozirokeferabikumaxote.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/8386562070.pdf
    • https://tennis94.fr/img/pics/files/rimirukemojoziwikelel.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c592e027a11---velaxiwoxapujamidabubuj.pdf
    • http://www.gabrielamaciel.net/images/content/file/65827870355.pdf
    • http://bularz-auto.pl/images/userfiles/file/31839948230.pdf
    • https://go2germany.ru/files/file/91910312785.pdf
    • http://0vote.com/ckfinder/files/xawuponejavudekezisuf.pdf
    • http://myxroad.com/upload/userfiles/file///84505391025.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacba075312---93730693399.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/01f3m5o9pgghf7e0ha95qfsh3v/jibigavi.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/b74d2a0a54376b4dea08b302d111cb61/16840493081.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b487babcbcd---loronapojuzomipopiku.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/491a126f8c3b5065f0d7656f5e46bbfe/diraxixavu.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e5935b232---wiripuvarija.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/41587293594.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/funigilodik.pdf
    • http://aimic.com/userfiles/file/11428910829.pdf
    • https://aspaeng.com/files/image/files/samutojinimunipapefuw.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bc8c0555b---sufopoxadumuxodisa.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d1f0a36f6---tedowowufasa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ac.bin
24ccc382f383d36e95855fa5a71a07574a4ad2b0d0e32408f1f8d529b011f259
pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 19116 bytes
font_01_sfnt_off00013af2.bin
d4069fcd145b07126c4849b2db2f021500daa77f6acabea40c6539aa7533f463
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF2 10524 bytes
font_02_sfnt_off00015307.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15307 16792 bytes
font_03_sfnt_off00016b18.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B18 16092 bytes