Malicious PDF — malware analysis report

Static analysis result for SHA-256 339b0b1b284f6aa5…

MALICIOUS

PDF

73.4 KB Created: 2021-09-24 03:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bddc7e7196de3a30c450575cac5f3b01 SHA-1: 7dce1ab6029920b9f497de50b4f38234adc6fa50 SHA-256: 339b0b1b284f6aa5b0f9088590e23c48f6ec51e3bb2ad88fdfcedb09106ffad7
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with many embedded URLs pointing to various websites. Several of these URLs are hosted on compromised CMS platforms, indicating a tactic to distribute malicious content or phishing lures through seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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://fosterfreezesantarosa.com/uploads/files/75089535290.pdf In PDF document text
    • http://zkojicin.cz/userfiles/file/favabubegufinoje.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/xuxajinixigezivozilodeje.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0b7285a4712ccf42d3bfb23b989863c3/kojevanobiduvulitoli.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/84889231354.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/savejasotuvanuzozawu.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/79298340194.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/82686756896.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/2650043776d33b524c2e352653bd507b/kazekawesixofasuwom.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/1735858683.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/14152631683.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161456f7dee303---5747490256.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/mebafojimaxuruwerir.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/mujigip.pdfIn PDF document text
    • http://rem-proekt.com/f/file/18856072526.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109050307297672.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/50043530812.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/68392625955.pdfIn PDF document text
    • http://saaretravel.ee/images/file/getativesilefofu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/fc1eae5ce1536e7b44063ec04d2713c8/66794001471.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/xulapi.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/72452548266.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/jotuxenadufomelugonaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=app+to+make+memes+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_off0000e0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 10580 bytes
SHA-256: 616b533b2519719007ff97f05f898daeb6508dfa4e8ad41abb9bbea60d960a26

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