Malicious PDF — malware analysis report

Static analysis result for SHA-256 9831fa30de785d0a…

MALICIOUS

PDF

83.1 KB Created: 2021-10-07 03:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d12e31e1390e1433f4ac53e5d1284d7e SHA-1: 7ad0e812403b2caa701a9e0c8f6a858507ce5ea9 SHA-256: 9831fa30de785d0a1afdaf24eef054855a6df95b09ce5a587f995efb66b000f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting, forming a link farm. This suggests the primary purpose is to redirect users to malicious or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 https://smidgel.ru/uplcv?utm_term=tangled+movie+with+english+subtitles PDF link annotation
    • https://nacionalequipamentos.com/ckeditor/uploads/files/kitixazazofuzofinifunaze.pdfIn PDF document text
    • https://mu3yc792xh-rl1.com/contents/files/delutobojifaduzonomizafi.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/bogakiwu.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/gapakapasubidasemasadikim.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/fabopejoxokorepa.pdfIn PDF document text
    • http://kamila.mebel-moscow.com/content/xuploadimages/file/favitufe.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/jutojuj.pdfIn PDF document text
    • https://subarini.ro/mm/file/xasafakola.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/20225968704.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/77823471174.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/50badefc38e317267ddfe8c03d8e3e3c/satujobaxekodabamotopi.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/f749f6342840eb1509db5b00cf240596/98461286153.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/798fe1fb40783381dce1ba88ad6cb937/doregidubebivibik.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/57f27aee3069cc8b5f9a9568be75d2e3/63084209623.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/kikudosunixofoduted.pdfIn PDF document text
    • https://indian-sped.szabgab.hu/fck_uploads/pdf/lorafoxekokit.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/pemotijalifafiruniworiz.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/felanilutavunokoriz.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/34018757978.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/fazolu.pdfIn PDF document text
    • https://wasael.com/userfiles/file/73405063208.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/97167091370.pdfIn PDF document text
    • http://gamulchi.org/userfiles/file/31159128927.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210928_111047.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/jazaj.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000d8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 19804 bytes
SHA-256: e65d2df33c5b3810306f8cb320e25ee8e0c308559b5594782fbbfdd2a88b6455
font_02_sfnt_off00012551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12551 10948 bytes
SHA-256: 30c076d3ad6f2b5fe104a9d11376680755c99adae3746b54bcfedb722b27bb47