Malicious PDF — malware analysis report

Static analysis result for SHA-256 27686ccaa203e360…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 06:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c30a88eb23ba0a2eb66426cbc9806175 SHA-1: 73e2fdff8def576cbecb473c9ff23586aaf5c7c9 SHA-256: 27686ccaa203e3609a8c5f3e20dab9a958e07eb95ff17fdfed26c6326841f4dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=gun+master+3+mod+apk PDF link annotation
    • http://americasbestwingsbeltsville.com/uploads/files/fetufofiduza.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2e32c81d334ff508e16ba1f6e3e60256/mofawozepidubeji.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/12300143606.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/pujerofo.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/30702894969.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614145905dcc2---ladiruwajezako.pdfIn PDF document text
    • http://jswenguang.com/uploadfile/file/borizase.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/rekijimuvogibipubopavo.pdfIn PDF document text
    • http://wernitznigg.at/files/59477921421.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/42056968952.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/61817780758.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/papexuxorugubokopiji.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210906124809.pdfIn PDF document text
    • https://bak.vn/upload/files/nunomigezubifurilaroleke.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/webarakixojuwanemabadid.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/69373485804.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/buzaxabelumuwojolalureba.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/39607388087.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5a64156a1---kosikusuwiripawad.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613740dac9f68---zifopur.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/54430190780.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614387508942f---45530858755.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/55402178891.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/sujuw.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_off0000d531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD531 17156 bytes
SHA-256: e169c3c4312bd14b0de6e4f12688c318c566dcacd943ee4e8a1991cb6db98605
font_01_sfnt_off00010179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11990 10820 bytes
SHA-256: 01fd46ab3c3efbd5f018d292047b0523b0219c5eff1dbe982259635781e49ebf

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