Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a16de7ef7d4ae4…

MALICIOUS

PDF

72.5 KB Created: 2021-06-27 15:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 036c19465a5f07b2512d70fc53387e2a SHA-1: 0e7745322ffac1ca6d1ee6055fac8fc039285811 SHA-256: 42a16de7ef7d4ae49bb000fd514afd15cc7430e5dc8a761224152c9d7554c9c6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve to distribute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd3f2c3ff4---kabomezubekop.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bb124f034d9---vaxevogepiwamufadofubejo.pdf
    • http://maslag.eu/userfiles/file/tizupu.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a606c2941bf---mitukajekuwik.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/7pf5gqtqce7fv2lhjro4j6qkb2/zuliresonizilijuve.pdf
    • http://topas.lt/userfiles/file/35555201133.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaf6a692dc---luxunoluwi.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/e2udkjrsqqvllioultajqffc26/woxovaropikenozi.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/a840lh45gkft2tk4b80741gop3/tuxunafasas.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/kpnigf65ur5l0isj2popmkh3h8/50486830592.pdf
    • https://info-jimukyoku.jp/lot/upload/files/19501417664.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/879d33322482cb9dfbb3075ed012ef39/gegikejed.pdf
    • http://musorcentrum.hu/files/article/file/21247306007.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f420d0dab---murufobokaxoj.pdf
    • https://sgcaregiver.org/contents/files/55504780814.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/s0a3j5hjv637sl5oh1j4ol65ia/62398687721.pdf
    • https://angkagenap.com/contents//files/relixojujazoxebitura.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b0d6cc1d18721c5d31906db859990ae/kelofowozawosa.pdf
    • https://nanyangtextile.com/userfiles/file/sebesodenoxuzar.pdf
    • http://bi-acaovo.com/upload/files/radozokamofoxi.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609241f18e1aa---11389740883.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/57031404885.pdf
    • http://tutaylamhet.com/storage/ckfinder/files/18773468858.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=bound+and+gagged+girls
    • 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_off0000bac9.bin
22cc76c579b908757ae6ba910f25041f9afad35edf1b55f209efcb6ab742c11a
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC9 10480 bytes
font_01_sfnt_off0000d280.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD280 16792 bytes
font_02_sfnt_off0000ea92.bin
f22ceaa67d2e4725313e34fc76152da27288a87390c2d673ee5bdee2a0d9b50d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA92 16424 bytes