Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b5f0a900da4d48…

MALICIOUS

PDF

84.9 KB Created: 2021-09-02 03:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c05aeeb29aa268a959648c986dcfb1c4 SHA-1: 25d986b959d6cb30deb45eb04a77230c1d6d0712 SHA-256: d7b5f0a900da4d487fe71adc4ec8d4f8a8526f4673f4b50676efe336e9774c68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crysiq.ru/uplcv?utm_term=the+lcm+of+14+and+21 PDF link annotation
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/nfe5cr8m52bb1vv59opehqqgf8/79794719666.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/wejokexuzoniwesesef.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/0ug69u9ucuuihn91lsrit4vaa2/wudaw.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/08/05/file/20210805_081103_158.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/5456f1b0fdefa30cc030b26625ba7304/wufiguzogewavuzelot.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/4313868233.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/16193296529.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e337ec9242---pikobivelevafawojumot.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/20359399743.pdfIn PDF document text
    • http://sakem.org/userfiles/files/xisefofugozor.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/4fe9e9aabe8f8f26e9dc01619dc40122/pofonabalokajexobetevopa.pdfIn PDF document text
    • https://nexusmediation.nl/files/15760865087.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/peritavam.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/3a7e85c9b20caae5b0483b737bed12d7/pidesofesimunekupujufena.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c352e4590f0---89231688292.pdfIn PDF document text
    • https://ibextrail.com/editor-images/70606593260.pdfIn PDF document text
    • http://yuhongzg.com/d/files/3018365677.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/55b7af6effda05c5d0cc0c19f2fd8199/vuzofipiwujanavuvirujoku.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/5iu6v50163sfdg3p7cbbt33575/japoxij.pdfIn PDF document text
    • http://elpijisystem.com/file/43683625091.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/h8hijvfui48j2pep8dd2ofues1/zoxipowabenanajoxevejovud.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/1622481956.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_off0000e199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 19988 bytes
SHA-256: fd06ebc52c3b0ba8844f9514c9450a7bce5f450be75344a889139618a82f71d7
font_02_sfnt_off00012e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E22 10496 bytes
SHA-256: 4314d921321be919710b64152e52365666d24c2259f3ffdf60c25b1881d434ad

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