Malicious PDF — malware analysis report

Static analysis result for SHA-256 e106019b904ef759…

MALICIOUS

PDF

68.3 KB Created: 2021-09-08 16:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 5c9b49c89b07ea9f2fe870dcd81a594f SHA-1: 27d9582e497bcff62c9687baba5b1fa1bcc07639 SHA-256: e106019b904ef7597ce80ecf8f39ff33dc7f4c079800da0d2925fa3db9a5ff16
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pixomot.ru/uplcv?utm_term=medicinal+plants+project+report+pdf PDF link annotation
    • https://itracmediav5.com/ckfinder/userfiles/files/timebanepaje.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/baligapagumokax.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/98761924033.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/viluzuberi.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/nezatiwitupukid.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/fubanalodawimowuxuseburi.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/rumogutigeno.pdfIn PDF document text
    • https://baongochoa.com/upload/file/28128192415.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/55892824204.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/bagilaxinegukojanifudabin.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/dogitelisuragijosigifer.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/govolokuvixenom.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/risewolabakovaziwa.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/nazivelesojapon.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/89627904521.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e5a528849---nipazovumizuxalekori.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613206294713f---wazegigosakasaxep.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/jejoduvujazafum.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/bebutifiwamumuwivale.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131732cbe230---vajadi.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/1540360704.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/gomibasojunuwikowenebor.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_off0000b06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06B 13924 bytes
SHA-256: 7d5da132071f3edb516d9411c5ac50b91238e3960a1e8809acfecf2467b9eec3
font_01_sfnt_off0000d290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD290 10736 bytes
SHA-256: 9c696cb4c2b806cd23982640cbcedea377e9273c213a1ecd8467365b36f4531e
font_02_sfnt_off0000eb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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