Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12cf643fc6ae5ba…

MALICIOUS

PDF

131.0 KB Created: 2021-07-29 23:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f8f6ea2b1929883ce94341a73a4351c3 SHA-1: 0e3a91364ab7f3201da849a07ff3b9ae10ab8011 SHA-256: d12cf643fc6ae5bad1259987fa6293c96f10b390f9d3182fa4e5bde3dc737c54
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tecnicadovolante.com/images/file/6274063165.pdf In PDF document text
    • http://szentistvanpatika.hu/upload/file/redar.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/18173571674.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a389ddc8a14---rugaferukipugodikibe.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4b3faeaa9---80605708311.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/89027275521.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/ead2c8fa7c8e972cf9221cde4e5633ed/78599008744.pdfIn PDF document text
    • https://menu2uplus.com/images/file/91875966686.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089949c0da70---wololed.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/06ebeecdb582e2c4f50892f2a6cfbe86/87716214910.pdfIn PDF document text
    • http://charivne.info/images/file/ruzosazamukuvipoweni.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/30289222529.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608587f00b83a---10161569106.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/japqttrm1962j5fkoec0jraom7/kulujanurubigabokiz.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/69acb417e053f18ff4ef005359f32b1f/tabinapirixe.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/ks266q4e0glfvf3k1cfrgmdcmu/5363738552.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/4775995607.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607899eec45c9---76709802788.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/tewozepe.pdfIn PDF document text
    • http://4bx.pl/public/file/79472386419.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf07f68a11---fodumuxanabapebapukik.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1daa63a4ac---gisuzakuwezufexaw.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/55467606932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=classification+of+living+things+lesson+plans+middle+schoolPDF 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_off00019ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5F6 11064 bytes
SHA-256: 32b31ce9ba4933a5d5bc34278d1a86ceb1da35797e9766cf006184d68ed1e31e
font_02_sfnt_off0001cf5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF5E 17408 bytes
SHA-256: 32fa1a5202e2853f209b84c502007ad6ab2e85c29f3c5b714ed45bde7520470e