Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a7fdb1657c9977…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 05:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b87e2b10cf742aeff9108d4b53905582 SHA-1: d229425d868649241c44d7790d1356610ad876f7 SHA-256: d1a7fdb1657c9977625cb73bfac8eaf642a43ebca2be18b32a154a67cde432e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with several pointing to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL analysis point towards a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://danfort.lv/userfiles/file/78559922818.pdf In PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/lasejafezifinori.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/93045733521.pdfIn PDF document text
    • http://jinyudachem.com/upload/files/64531955437.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/57753216526.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/effab2a3298601fe84296d1a6f6238e2/bututolufidenelasuloz.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/dekexefene.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/nuxemerojofezagef.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/5o21qkvkbtdvq41b7vmufj606r/zunizudavufonilonupinitok.pdfIn PDF document text
    • http://mfcpavpos.ru/file/38610377645.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/46159142279.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161421a2333969---tumoxixu.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dbf6ebc1f2---suvijagevi.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/40867223489.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/nenonemetusidotiwutefa.pdfIn PDF document text
    • https://clove7.com/userfiles/file/19384921875.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/9197639662.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090106545373499.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/72657064653.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/lolewepatitajuf.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/56033347434.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327de4480d6---98078444041.pdfIn PDF document text
    • https://kaparatt.com/images/File/jodarag.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/27067322684.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161517a9e33f08---48451296111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pumping+simulator+apkPDF 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_off0000b51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51F 17120 bytes
SHA-256: bb7c5c865f29c695c5ffaa0f0eb957c1bb4ac48fa3ad477cd8c643ca30b5e373
font_01_sfnt_off0000e067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 10656 bytes
SHA-256: 894d0f6ee7eab72b4f3db8ac8761d8575956964ebfef2673f79b529859c1be2b
font_02_sfnt_off0000f8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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