Malicious PDF — malware analysis report

Static analysis result for SHA-256 738a59772d3367d4…

MALICIOUS

PDF

84.4 KB Created: 2021-09-13 00:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01ffcc6c2107ff545f009dc06982452a SHA-1: 263993f21d1fbb9197c2b15c6d27859891ecfb85 SHA-256: 738a59772d3367d4d2f7004058648080b354c1e8dedeab935dba67370507607b
164 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://putzlappenborner.at/editor_up/42722145841.pdf In PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/domatamuvusozuderakavix.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/50865099545.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/mutakudisoxejenojewa.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/nunugediludenimezap.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/rarugavovurur.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/42639615262.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/napijitiwezadoj.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6aae61b51---47171312831.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/xuvajuvajuwuni.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/dmq3ms32r8g24n8mn1tqnpbau5/75861957615.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/suvidokudapo.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/talusivovo.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-11/20210911154450108697.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/92816638807.pdfIn PDF document text
    • http://artediapharma.com/upload/files/38204610130.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/fatimokugomugakegivi.pdfIn PDF document text
    • http://fitviewer.de/files/file/widigomepopo.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210906214810.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/sugovupusiturugo.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/2648739588.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613db781ee4dd---sisimivukenug.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/19693593535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mary+queen+of+scots+movie+watch+onlinePDF link annotation
    • http://tes-sys.com/uploads/ckfinder/files/20210913/16314849981939.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_off0000e315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 18016 bytes
SHA-256: 9ecb4dc80b86516ec2ebfbc4518d528eddf71ecba9e595f970ad4c546a6d4920
font_01_sfnt_off000111b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B5 11104 bytes
SHA-256: 4ddbf8d048a62b3204c77098f483661d5a416c3c4a1880a47600ad26ac4a5c7f
font_02_sfnt_off00012b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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