Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8c46d6015d3d44…

MALICIOUS

PDF

72.0 KB Created: 2021-07-08 20:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f0b80e83dc2cf5ca6d6452ce20775afd SHA-1: 6e4d1af6b220554e0c631d23d43a108337e57199 SHA-256: 7b8c46d6015d3d446c192e8e6c9086f4f737e4fae22a3a08ef58c3658a5d5b8e
154 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. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it's used for phishing or distributing further malware. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6724

Heuristics 5

  • 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
  • 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://queure.ru/uplcv?utm_term=self+castration+meaning PDF link annotation
    • http://yasaitogo.com/uploads/files/ridakakesumenasiravuf.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef72287946---9381909537.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082874fc01f9---88711208613.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160880413a6b21---91672815817.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a4cd6acaf1f8117dedd97c462a158bb1/rurogunegazoxafuwutobuwet.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/bikigivomujeruxodovuzefad.pdfIn PDF document text
    • http://chromoink.com/updates/file/kupasoj.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b3a0ea84b5d167842bf30d588edac30a/68909348794.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/34768281049.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/63966990514.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/mapanavixaxonowigede.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/64641423562.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/31194045866.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/20253777608.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090f567c7e4c---gezevawizapalule.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/paduxebifut.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716001dd488---89224027015.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160812a676a572---51330058744.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/57526435118.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/nidnnv24c6sjg9s5ip4250hvdq/xeteneturuvumuvodofazup.pdfIn PDF document text
    • https://sca-kc.com/scauserfiles/files/64712572837.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c33622b0407---tesuvu.pdfIn PDF document text
    • http://stylekd.ru/files/59413520239.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/t7i9n9kitaon3dn0s4mi017vm1/bobelopatodafepaj.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/c7aa9c43b4351f804dfe8b6577daf19c/kalolejaroxajaverete.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/pesuxib.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 20024 bytes
SHA-256: b34949e5f1e376a5cfa7a912ea29a144f4264c1a721c3e764088c65454a71dde
font_01_sfnt_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 3252 bytes
SHA-256: 9867e9ecb337890e9694e91a73d5261dd3f79b835062d77b5a95c284f91fd55e
font_02_sfnt_off0001084f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1