Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9eff40dac3696b4…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 13:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 528ee75af3dbfe3caaca26130b158a34 SHA-1: fdda1e40bf526817d54791139bcaebdf52aa5f44 SHA-256: b9eff40dac3696b4b8a8b0bfbafc927c4d15b6d8cbc9698d917c753f19540590
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external URLs, some of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload. The presence of JavaScript points to T1059.007, and the overall nature suggests a phishing or malware distribution attempt via a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://deborahkay.com/ckfinder/userfiles/files/suwagimiguronukux.pdf In PDF document text
    • http://computerdoki.hu/user/file/lapumikiwewowevibadavu.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/30007462458.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161326d648912c---26959445399.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/garelezoxenavofajidul.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/13044615011.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/17136688268.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/10163160538.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/94807405056.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/muremuzivopu.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f01c43f13b---zopalepowova.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/83687594259.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/10117626490.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/rivijenafobazujej.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/749a9c042d16a57e6f08fe38d8c1b610/42895040105.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/zufomumuxajagop.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/0d075d590f09e8e5cca6164e7d16196a/66942662396.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/zubuloro.pdfIn PDF document text
    • http://dentherapia.hu/files/file/12594761167.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/4503237141.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/lafelojonaweral.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/zafarujoxojapotitojok.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/pixitefelanojun.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/netemuvexagevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sega+model+2+emulator+apkPDF link annotation
    • 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_off0000d4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD5 10760 bytes
SHA-256: 0a535290dd5232dcda9b5d36f493a377308d1696505addee0bfeeaad7624e23b
font_02_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 18304 bytes
SHA-256: 75e63e8ea50d0899010d9a3ed0bdc252ee16d02183ad0286f4d4cdc5b494ae19

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