Malicious PDF — malware analysis report

Static analysis result for SHA-256 faaa51dabe822969…

MALICIOUS

PDF

72.1 KB Created: 2021-09-26 19:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba0a562887853b842cefeb4c7c89bead SHA-1: 039fb566a73cdb7e7377e3e5adc81a5af97001dd SHA-256: faaa51dabe8229690dfaf7a4daffce015c8c3cf103294292b83c92b83f4c0a5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that may leverage embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=cross+dj+app+2020+download+free PDF link annotation
    • https://discovercefalu.com/_data/images/file/dajisobupu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5e9010f92---wavinelujulatiwujowate.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/54889646794.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/33836421056.pdfIn PDF document text
    • http://turatabor.hu/media/xevijukutuxoduzo.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/lubenotajitalutibis.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/45471731327.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/37345144431.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/1310457544.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/42394702.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/jetalaxegam.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/delasekifupatogigumegus.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a3a66a6097ee55fadd941e3fe4fa5c9/zabilitup.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/92973862871.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/67389397480.pdfIn PDF document text
    • https://x-software.cz/data/file/42059817407.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/bizulugetowixub.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/mufuvo.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/davokodiregujajifano.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c45adc385a---volutukumuvibigizitomono.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/medevofasirolapevovimowuj.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/ba25bf7e3ec812159809baac39c84e7d/makimebop.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/tefufisazawej.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_off0000b357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6E 10788 bytes
SHA-256: 8e3426390719c8478c05277e50d72c07445750bae4124dfcbb0d282b77215791
font_02_sfnt_off0000e48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48A 18124 bytes
SHA-256: 49bf2e2309a442a711f4f2a631a43d3f91f62b1fe88bd533e08f714eab9cdf71

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