Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d91fd6fc4a8621…

MALICIOUS

PDF

94.7 KB Created: 2021-07-30 02:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b3c6e92b3fd2396b5ac093fd2f67037c SHA-1: 29a278f74c9ce707b5509f3d469459bc65823ffc SHA-256: 10d91fd6fc4a86218499e8a7ab5f0e6971adf8a35b647fe66770b5eab4c1cbfe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier also strongly indicated maliciousness. The embedded JavaScript and the nature of the URLs suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=sa+ngalan+ng+ama+ina+at+mga+anak+full+episode PDF link annotation
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/rosq6mobsujomc7gtssdcrrlp3/defiruded.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/14662356958.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/dasojofozokabifanexexisa.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/nepiguvireludex.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c1d02428a---xutomijewixul.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160af73fad06b8---8980687794.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/salujirofajugugivana.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/86224343758.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/84905719812.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/54185173455.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b772761b8fb---81974611162.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/29072b52db9d34c843b5fa063a85aa60/84794631848.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cae8618cc4---73700955792.pdfIn PDF document text
    • https://hcviet.com/img-phuctri/files/44162929746.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3b4b7ff949810995b1013f3cf5416039/dedalemoguliwamezos.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/710dc7024a531460af12375ef63bff54/5215832966.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/livuvajugibedaletobipa.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/guwutuma.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/xatewetikamu.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/54540c874ce81a9ba389df3643df39dd/19388011033.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/28637291709.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 16192 bytes
SHA-256: 97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd
font_01_sfnt_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF7 18812 bytes
SHA-256: 942a9aa36c127c3ed6f079c5eecb09572e32c3a4b57d24dc6ae8f11ca8a68785
font_03_sfnt_off000150eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150EB 11008 bytes
SHA-256: 02fdbadaa082c963d65e91f9d5c043992d1920fa194fdc288486a69f01e86816

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