Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2532de614abda73…

MALICIOUS

PDF

94.3 KB Created: 2021-07-30 17:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 148a5c86f8be0c519df16e6453aea099 SHA-1: c4dd49d4de4d4169dbd59af758e735590b47adde SHA-256: f2532de614abda73fb77d539c2f0750a3ae9f5689acd74cb51565bebc4608237
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress sites. The presence of a link farm and the ML classifier's high confidence score indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wills.sg/wp-content/plugins/super-forms/uploads/php/files/f23b057a344ea1e7a5898fcc0c559d30/bemozisoxadowekozobokokix.pdf In PDF document text
    • http://kovacsoltvaskerites.hu/images/file/43463636238.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/tsdmj1um4nb3nr8tog90hfq8p1/wukapomepamimunobelo.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15552919327.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/98408845111.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/qmkreqohhn6vs0qjmseq2ailnc/mujomiwavewu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d78bf9aab3---96203024688.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/62658156278.pdfIn PDF document text
    • http://tdfinalists.ca/clients/43449/File/171317615.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aace692dbfc---74355959807.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/51338800962.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/pakopupa.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/isinkiicsi7vhih51qhj2dahp4/murebosolawejavagadavi.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/balowiwowemuwafobi.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607465d6a69f7---60995628146.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857384c68a4---mupidagotowotiwoso.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/19cf0f06533db97ef9163e9177c91bc2/kawubexusemidaluju.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/zafuxavojilijelibul.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/48533253018.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/5bd6ebf6e26a83461f97284706dda892/fuguzusu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b70b709596---78964011689.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/c06fc4f4b3a35d6ce1bea060c0435372/2683367102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=best+buy+playstation+5+restock+notificationPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 18208 bytes
SHA-256: a5e40a039721aa286d00b089204f40dbf684dbcf058c239d28c529eae8463564
font_01_sfnt_off000121d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139EB 11108 bytes
SHA-256: 05d24dfa0288400a8487ba225b9a6bcb1d58cac234a610dbdbfd1cd0078c5640
font_03_sfnt_off000153dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153DC 16628 bytes
SHA-256: fcb8239145163a78dbdb9370290b3c35302354f3cad50d97f94fd63d9cd0933a

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