Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba529d7e15bf7f2e…

MALICIOUS

PDF

84.7 KB Created: 2021-06-28 16:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0fca3f6f5dcdd9a6e9363c2ef6e14bce SHA-1: 1d8652846aaf6b8e9c77ff17bbf1855c26eb9b86 SHA-256: ba529d7e15bf7f2ee493f90806a0c9bd09fe12c71477210eb588b09b738c1232
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites and other domains, suggesting an attempt to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://ahchala.com/img/file/44090566922.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/l0hneegbeof5hnismp0jdb16mt/60433043730.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f87134631---nuvevozakudaperutafolit.pdf
    • https://fa-vietnam.com/webroot/img/files/gukazabo.pdf
    • http://folientastaturen.pl/_data/file/67312738507.pdf
    • http://zrdb-drogbud.pl/Upload/file/14606707705.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d251084fd6---kodojimezegi.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/418f1ddb77b1aaaf2b02047295d7b8f8/puxebipatidageguridutuw.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8e4a72f14---49549347929.pdf
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/65540669669.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1de37ce91---lesixe.pdf
    • http://goteneplast.se/files/images/file/46168777143.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/258c9eefd16e1638973078b2fc2f937e/vusunafunofozudomato.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/3ef9b9152439fc0976d5c7d9ef877fa7/77420551126.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f72aec761---51533808905.pdf
    • http://fdscience.com/UPFILE/userfiles/files/gumipokepewime.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/38mc9da2jniko11a55e4q9qr6e/matitifexukitiwesam.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a9a7be59b34b2fc40957229e9e82d16e/somifujakoxevotese.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/46df2f4123b3ba7d9ef111edb936be60/50612680204.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763e8cf3f17---72954284159.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/743f4de14302f90ab8929c2b4e1edaff/pulatonatuwiluxov.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a79cf551566---33100034273.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/lcqoo9ip2mdt5alukebn89r8eq/mejetak.pdf
    • http://franzoesischebulldoggen.eu/userfiles/file/8004805818.pdf
    • https://tavio.ru/files/file/duguzevugajisojatisuziwe.pdf
    • http://metapolar.hu/tmp/pibezataxazagogesakibir.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sweet+potato+cut+up+in+oven
    • 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_off0000ea60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 16792 bytes
font_01_sfnt_off00010272.bin
fb9b755f1e57b231d3f7dcd1419d3d3df1b4e0904a1c210217964e007992ed6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 16592 bytes
font_02_sfnt_off00012dbd.bin
0d80e9b3ba90e9d2769ebfe02f489863738e2619f8b1a96963e1e5130df849d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBD 10380 bytes