Malicious PDF — malware analysis report

Static analysis result for SHA-256 4055aac228e9580d…

MALICIOUS

PDF

90.6 KB Created: 2021-07-18 15:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: de08054d45d1bdb2635f437a63143764 SHA-1: 559474eac2612c08a7938243b096c849a4e7361c SHA-256: 4055aac228e9580defc4abf466ba0bf42b3c82d8a7015d0261875c59fac2ab94
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://tenfci.org/userfiles/file/kajuxaxirovewinoziwot.pdf In PDF document text
    • http://hotelgiottotorino.com/userfiles/files/94580579536.pdfIn PDF document text
    • http://tdfinalists.ca/clients/43449/File/burijabol.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099c13048a49---pevamepofopobi.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ionftuats97o30ftn9e24ej2dv/majoviguvoburulunavimevi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bfb13cd45---nesapabugex.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/24149580668.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/t3evrgen9k4jk4nocq1a04u1a8/98441304344.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607992da1cca7---pukaso.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/vinipepasupisibalarovuw.pdfIn PDF document text
    • https://kuepancong.com/contents//files/mizipopufofodaputo.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/52909272100.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/mawagaliseludajakuj.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/56819171783.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/22806948989.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/sevute.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/zatitomesifuj.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/33840459919.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cd0fd497f---1343325383.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/degijumatumemigotokapadoj.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7497dbf612da26358e174b237c0e9407/lijofopobojuwozi.pdfIn PDF document text
    • http://moneymaker-gold.de/files/lumonenozileb.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/5a2445975c1c9743afa84c232b2ec737/xonurisobimonanada.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/5do8l0go2dmbevk6r6kk9ckqo3/jezugorirumigebo.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/99989515016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ju+on+the+ringPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED39 3836 bytes
SHA-256: 9caa010d05d69d1d8219ad5c044177a4056d4a2202490a89e4dc2feda73fdebe
font_01_sfnt_off0000fc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7B 18540 bytes
SHA-256: 2171740b5d6ea8f551e9afa8652b7e6014275bba34c3732f8174badb0f721ced
font_02_sfnt_off00012cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000144f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F5 10104 bytes
SHA-256: b52372f1e2da92d9a6bf70033e22d608a7088a0e17cc37ae3ca98a337e409cbd

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