Malicious PDF — malware analysis report

Static analysis result for SHA-256 f806845595976b03…

MALICIOUS

PDF

66.8 KB Created: 2021-09-10 11:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2ae627bf610914851be4e996ec12ad00 SHA-1: dccd9caf7ce5dd0367529fda72b27ccebf54f63d SHA-256: f806845595976b03768a495524a30ab8c29149f2f2dcef64134f90920823393f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF_IMAGE_LURE heuristic indicates it's likely an image-based document designed to trick users into clicking a link, which is a common tactic for delivering malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 66 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://crysiq.ru/uplcv?utm_term=how+to+remove+my+number+from+private+number+on+android PDF link annotation
    • https://jasmijnbloemengroen.nl/userfiles/file/koledofamogudomufo.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/8383542119.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/riripupevojanuluribodot.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/sepavewipixuretiw.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/36832522261.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/lolupajona.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/xijobir.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/10550559261.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e378855a---81722448141.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/70528331531.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/096a665a850aa1088326f0d07af86891/wifavirabufireginubewi.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/12910384054.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/borirawixel.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/7928124798.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/82548636175.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/2949948477.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133c374cf645---nurotijemovigi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9a9de43f6---toduguguturisikazakumal.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/35170695037.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_off0000aa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC296 13796 bytes
SHA-256: 69fb46f9a3578642477464d4bbe82165b6ecc7501ed7f4923beff15c4c78fb23
font_02_sfnt_off0000e48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48F 10940 bytes
SHA-256: 380ac668bfe3d053b4c8cf85bc229ce97664d6cd0d7640c70bd70fdefb920430

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