Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada0100bc7cbcb4a…

MALICIOUS

PDF

79.8 KB Created: 2021-08-16 15:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40bd7ae8b12b18564c7cc59ae027df56 SHA-1: 1e89d0d67e1dabdab6501d470596fdbba466e7ed SHA-256: ada0100bc7cbcb4a98be0580731b0280b41c72934551341e473f3ddaa8601c23
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous links to external URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the download and execution of a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://gospel-pour-100-voix.com/fichiers/newsletter/file/49714044213.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/089df777c811c9e1cbd57ea6360d78e2/67803042790.pdf
    • http://s2ipower.com/survey/userfiles/files/niwukuroputumi.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/cb1835657de559cffbde953bcfb29d87/savenegefox.pdf
    • https://sistemagestiondpr.com/userfiles/file/dijisanolenerikudowinu.pdf
    • http://mim2010.ru/userfiles/file/35180282835.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/e94d24d23e282482e5d3b004599daa28/zakoxiruxomuduzukagu.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/db722313d5ced4a81f63fa93be9ff2ae/rolugedisezedamudemodobi.pdf
    • https://kham.vn/userfiles/file/wuledu.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074303cdb8df---42394829831.pdf
    • http://beateromer.com/bilder/file/tuliripuzi.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dda7bbee07f---damodaviv.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ls3q68comko8g4eficv9mv1pm3/22920011251.pdf
    • http://ventilatoryzlin.cz/images/file/74990797806.pdf
    • http://peeweeslearningcenter.org/clients/5/54/545fcf94abc6bccf175f3035c740e6d3/File/rexujobojokagabosale.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608560301c746---94247338887.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b799b24a62---maxenejunegimiponiku.pdf
    • https://jotelek.hu/files/file/palawevepigopigamiga.pdf
    • http://visit-pune.com/userfiles/file/xobujaxunil.pdf
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/83260558532.pdf
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/87499122240.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/1ee4736fe5dbcede99736059ecb44c3d/40385998962.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=possessive+apostrophe+worksheet+grade+5
    • 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_off0000d1a1.bin
9fab00c0968daac201e19e57e02a09eec535c0cdaae15a6028ad73759f565284
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A1 16680 bytes
font_01_sfnt_off0000fd18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 16792 bytes
font_02_sfnt_off0001152f.bin
034981093f8a375e56ed0c9f1d266e544b7c9c0a1507ff7cbc342d01b6bd2fbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1152F 10900 bytes