Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab274886ef933fc4…

MALICIOUS

PDF

74.7 KB Created: 2021-09-26 13:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a0712a69835e5821a4d2fe867dadd1c9 SHA-1: b12880e824cc111725967e0150d71dc83fd3e0a7 SHA-256: ab274886ef933fc40fa79325fe9a2f991e150f9e070fcb29ff2913dcda2dab1c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, 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 via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://husplaza.hu/editor_up/26048384997.pdf In PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/83823340510.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/53692057656.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/99170457063.pdfIn PDF document text
    • http://klemanpince.hu/files/file/zafakivuloref.pdfIn PDF document text
    • http://houselandia.ru/files/texodegadelixexifubapakuv.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109050637123712.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/sojagulepa.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/64691818735.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/xijaf.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0e0b4be3e---8303829873.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ead350845a3ad52f699bb40c53616c17/59901667611.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109261503293217.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/35279807272.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/24457176862.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/rawaviles.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab768ed768adc0d5c5d45baa528511f8/tedamopixobawogidofe.pdfIn PDF document text
    • http://mlight.cz/archiv/file/dogadifubadode.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/tapevapefu.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/parodazupog.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109111558231304.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/duvoweferop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=split+screen+launcher+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_off0000b8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B9 20196 bytes
SHA-256: 5e29ceaf32565f76749ed39b6e431ad074a133bde4e1fcd3b7d4ed55a391cbf4
font_02_sfnt_off00010532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10532 10620 bytes
SHA-256: d684944198d4d746bd458fe10f8bac69b0c1c84617ac2117a07eb69b7f40a7a7