Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6baa09274992ed…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 04:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 004e82d473989214aa1f7bd0d35a3491 SHA-1: 300cb7e9943fe353b6ef17616d6c69754f05f9a1 SHA-256: 1b6baa09274992edb47673ad694e26f39486f276f51122d4b85cba2c81e28bf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

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 http://bluecars.pl/userfiles/file/41749761052.pdf In PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160d83c3823317---melelil.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/figununate.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/sevemalojeb.pdfIn PDF document text
    • https://avela.md/userfiles/file/sezagesulakadepedolevijeg.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/wanijubugiw.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/3051783999.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/zowepibesun.pdfIn PDF document text
    • http://ubest.ru/images/file/84838670279.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611e3242794df---65015656134.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607731ba18b25---dupebedalututaral.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/nujozunexelekareze.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070e933121ca---35022207995.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/97971745528.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/b29fe10db77fcae272a13087e75e92b5/69955569484.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/666e0a0f049d6bfdfe8e59859d327308/wuderubemikati.pdfIn PDF document text
    • http://adice-area.com/pictures/files/sisizifejoraxofabuzuv.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/e89v26t15s66sk0obr71d1mos3/75723824526.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/2c0fd72531e329c4a78d0d573a6ba501/gavodemen.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/vewepoweripin.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ef0b3e321---36590270076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=lis+pendens+meaningPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/85236558723.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_off0000dfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA6 10328 bytes
SHA-256: 75c14bb2b9aebd4914895cd0763a0bce7dc7647b4652eccb6e067439acedf621
font_01_sfnt_off0000f6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB6 20468 bytes
SHA-256: 5cdb23eefb7f7da9197a44b960482077253a02f937633d8be4fc037bdfa90a0c

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