Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8308b448db49878…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 09:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 51b9c3855c79bdbb79cda4ee191e86ec SHA-1: 7d3dadb10c53b8e0f4ec8d5d374cedc87f63928a SHA-256: f8308b448db49878a74906aace3109f2943673d54df0229065b5556ea40d9c3b
124 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4210

Heuristics 5

  • 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
  • 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://princeworldwide.com/multimedia/userfiles/file/xoxarewunazaluropaxalol.pdf In PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/bc640b899d2fdb5c899d10057d1be79a/32406467290.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/45808941476.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/51851776424.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/53422203851.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/tafixaralevijogu.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/24561821109.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/fuduwuwexo.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/47691930434.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/95770420631.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebc93d9f47---lufupewe.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/40766815499.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/pebuvamavobagakilutakat.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/wuzuzulejirurezawifodeve.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/13899056772.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109021719298449.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14497735213.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/93711729363.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/bifegubo.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/8c299688be517508376d2b98576002e2/gokiduwaxipeleguwumedu.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/496030554.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/vijijozopegumosemoxexer.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/37982015247.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138da941b684---85845335766.pdfIn PDF document text
    • http://poorclarescork.ie/images/juzigexazezanumogex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=command+and+conquer+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FE 10496 bytes
SHA-256: 9bbf73ce09d88a4efb87985bcc5737ef838d0adc4b10b70505c0d0d5d08e8411

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