Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6e81083645bdf3…

MALICIOUS

PDF

85.0 KB Created: 2021-09-22 10:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2da97cf7edcd637a5e28f88c21d0cdea SHA-1: f89c89a4875fdf8849ccbf9787b8139b6399d924 SHA-256: 9d6e81083645bdf324309090f6db3e34d2219d89debaebc021dceab73c7693dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous unknown-reputation URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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=openload+free+movies+streaming PDF link annotation
    • https://dbmotorbrokers.com/userfiles/file/balasenozinon.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/pubejusibidekejetivawam.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/36874123686.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/37482007399.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/jibafarujevurazonodeze.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/07466ab0c64aaa42f17523c40f296d30/32859787697.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/puzuxo.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/24766117274.pdfIn PDF document text
    • https://ijpdua.com/contents/files/29465870008.pdfIn PDF document text
    • https://dukupahit.com/contents/files/fememuxet.pdfIn PDF document text
    • http://www.moyekolodin.com/files/35512426069.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/34298952896.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/girabojaxawunojojilava.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/7e511e550d581a93d582989773d84c59/42511395265.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410df05f15e---97926554682.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/66266268602.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/c18a30e96b9136312acbece986e5805a/44156888710.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40681316059.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/gegezopora.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/tutetuzog.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/lirameru.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4301c1d94---xunota.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/davagafofejituzezomodine.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_off0000e354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE354 10932 bytes
SHA-256: 59ea26e743afdb4bb494b3f1d2a8afcfd40220d4f1078786439abb0d16b1900e
font_01_sfnt_off0000fc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7A 19368 bytes
SHA-256: ca8d05fbd4dd4454ab9c2e3041c5f601d0a81c1254bcfa45a56c376b1f4f76c1
font_02_sfnt_off00012ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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