Malicious PDF — malware analysis report

Static analysis result for SHA-256 1985f69221432bad…

MALICIOUS

PDF

85.8 KB Created: 2021-07-25 18:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d6c8094e63a523ccd65886685ec4858b SHA-1: 95235c45da497f89b7917daff3ae55d1b7e641de SHA-256: 1985f69221432badab5ad2b5a5c9c0496e833d1b076353960f8f4790b3e0765f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users to phishing pages or download further malware. The presence of multiple links on disposable hosting and the use of UTM parameters suggest a coordinated effort for SEO manipulation and user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7953ab6ac7---50179551545.pdf In PDF document text
    • http://sotel-perm.ru/site/file/gelaladumuzo.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55f909a69---rimexarinazoka.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/969831e34993a366895a494e668bd7f6/mukupil.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/efb8f320dafe54d85c600aa97ccaed59/kegebemijifeji.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ggh6ub2su8mvp8pt43aho0bsj8/58424462995.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/68742704265.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160747b877f30f---nonezenapuredatafadufek.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/87277524737.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/54601912364.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/nazavolelolote.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aed8e6330b---51898357922.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/wepirevejuwofurarun.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a9c7c3576---povovifotakisu.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/vodiwasumopazudiwevoxik.pdfIn PDF document text
    • http://serting.eu/userfiles/files/zepubekigidugir.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607100a3c5e4c---21263646109.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160da09ed693f5---wefomuxekodez.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf14b33d9d4---1908302091.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/07aa2785f3e4a62a747ab2b81d434638/23767544599.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/60362310042.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/49939875641.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f388c25de89---dopegavetozep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+use+a+tabletop+fire+pitPDF link annotation
    • 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_off0000edd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EB 10564 bytes
SHA-256: a0393c1c91703a461a1bcd9db9ae9f40f71db32b9ee6b182d98bc081a1911c92
font_02_sfnt_off00011df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF6 16748 bytes
SHA-256: d30cbc66d257e534b17f88fba5f00ce29521263d4a896350cab98316b517b6a0

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