Malicious PDF — malware analysis report

Static analysis result for SHA-256 8602fb2bc267655f…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 19:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8be9d22db97613df70b2778752b7ae38 SHA-1: 10c3901db477db948a420d0ad2871e0162129b8d SHA-256: 8602fb2bc267655fefd29d451de74e30ae23759607fc6af98b8a8a249c95fed7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to redirect users to malicious sites. The presence of multiple external URIs and the nature of the link farm heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://jts-electrical.co.uk/ckfinder/userfiles/files/34458522538.pdf In PDF document text
    • https://soswzgierz.pl/web/uploads/files/lixamatigaset.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161484804874b9---dozuzele.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f088938a5b---16674532441.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/73886086634.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/mosanexasizonunov.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/87717106094.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/87132955564.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/767c1851f630f6b9258e43cc4d55bb2e/telebumete.pdfIn PDF document text
    • http://zerosquareonline.com/file/jelatowelewejalabojot.pdfIn PDF document text
    • https://atavio.ru/files/file/jazagugifozenezosazi.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/nogazuba.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/mekomabimik.pdfIn PDF document text
    • https://seger.cz/userfiles/file/22031984271.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210915232938.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/55227069819.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-2/20210902071404359629.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/ruwutaretibajalogita.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/90776105310.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/bilokujelilipiniwi.pdfIn PDF document text
    • http://wwsm-us.com/files/file/43510360688.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/47092da16de89bac3d1f2f59e4211e51.pdfIn PDF document text
    • http://geyuping.com/geyuping/uploadfile/file/2021090808380573499.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///65848873004.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/29418189242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=chop+wood+carry+water+pdf+freePDF 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_off0000b4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCF 10536 bytes
SHA-256: 302cc80f372949955f855c404040c1728de0a28070a5605fb969fb85ee5d0040
font_02_sfnt_off0000e510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE510 17292 bytes
SHA-256: aa7fdd99b25d023848820be444b339f29fecee3ce11ae92f738bddd21dc48dd6

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