Malicious PDF — malware analysis report

Static analysis result for SHA-256 5179081639d3b244…

MALICIOUS

PDF

89.5 KB Created: 2021-07-17 23:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba516b92ab14df3504088a7811e2f7d2 SHA-1: 2c6d97a9b02cd69ef5aebaaed7b0bf5e4cb1095e SHA-256: 5179081639d3b2444f6c7df504d1691f84cc1312d2bd37a0fedbe40566a4df51
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external links, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the heuristic firings strongly indicate a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://gitishahjahanpur.org/ckfinder/userfiles/files/rekemugilole.pdf In PDF document text
    • https://agermag.ro/mm/file/88862442122.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/9671529508.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/83876645170.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/55209753176.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f04b0c9470082e5d60a2960fe062a03b/18851547328.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/bomufedotuxo.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/kilasuzelogofu.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/jbdrddlnfllgkmdogca746c0ig/10819451395.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/03a01247d49486131124d45a2b581013/84613897410.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/c2ba282a592de69528d366e0d96496ee/fevelamevurovu.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9f8040528---zazomusikewipuretakefan.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60f80d73ae---dakimafofiluxarejol.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/f7718f687a2e6ce300b815b7f69cdfc4/5251970601.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/64119131634.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d5afaf3801a---goxibujit.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/596ccc51f349e15ffb8d9014868eb9bc/46549819190.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/48120976632.pdfIn PDF document text
    • https://www.epicbrands.co/wp-content/plugins/super-forms/uploads/php/files/86dc61e6c70e0a85199434a0cc37cb1e/15613890319.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a34f276218---30528153172.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e0b63d0f507aa03dcd110f8d8afb06ed/20981473131.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160717b2003b40---xakiv.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f99707d8c---zogeluxoxojanoduwigalelud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pea+mint+and+spring+onion+soupPDF 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_off0000fc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC36 17100 bytes
SHA-256: df28c18e9fedea06297a3e849cd087ff32f44b064bccc8e4398e03eec554c23e
font_01_sfnt_off00012853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001406a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406A 10792 bytes
SHA-256: f019b408c9d480a93047ca39dc616cf2766bfb1b69af527c6701b76914bfa6ef

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