Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7aab78df285e61…

MALICIOUS

PDF

85.0 KB Created: 2021-09-22 10:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d86e75946d7803701f78424b7a948626 SHA-1: 0acc104b78fe38ac6a52137e6520bb1b5b1aa695 SHA-256: 7d7aab78df285e616af13dc38b0cdf4a16197708e033b49293ca5a922dfcd33c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://wastran.ru/uplcv?utm_term=text+now+application+download+for+android PDF link annotation
    • http://xn--h49al71atridzo.com/userData/board/file/rojoxin.pdfIn PDF document text
    • http://industrialdevices.in/uploads/diselumomuduse.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614aca364c5de---duwujapiwawoluwafu.pdfIn PDF document text
    • http://8njl.com/userfiles/files/nofipejulofi.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cbd9a57b2---93238437325.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/30473682532.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9c445dc04ecd465c50dcc47ea6a63823/tisozujeda.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210912/0400457895.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/boratatugapemivixaxez.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/10254004439.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/todevipu.pdfIn PDF document text
    • http://hmed.vn/upload/files/82704124754.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/94255988795.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/mebofirubisi.pdfIn PDF document text
    • http://davobio.com/upload/files/kifekuxojabadebawodimumi.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/jiripukununenunagunezij.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/c7b4e1b9cc97e1b98280e4c0e293e733/84880796839.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/36083319717.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/70316835411.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///rudefekarifa.pdfIn PDF document text
    • http://standdominica.org/files/files/57058271358.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210906234813.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/8716526611.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/98963174212.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_off0000e62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62D 18192 bytes
SHA-256: ded3860bb6bf6e7bdd83a4da0353b5b051aa6497c0abb3a4387e19f0b48e202c
font_01_sfnt_off0001155e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155E 10596 bytes
SHA-256: e8399b429a14797300daa832f417414f7f1082a9d67740c749b755a16f6183d7
font_02_sfnt_off00012dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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