Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1360862384a7fc…

MALICIOUS

PDF

106.8 KB Created: 2021-07-05 21:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3afe93cd842d7bed54f8e76d52647744 SHA-1: aeee7da7dba7e95cffbaa3702f0fdba100dc9c6d SHA-256: 3c1360862384a7fc11a85b7047d6545cfa2aa878b7a39714a0d1b58489646b2a
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest an attempt to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084140eab7ee---fakixutodi.pdf In PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/fu6r9hknhhq8gp7ni40hj92etp/dozeviboruk.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/43717807980.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/45442124605.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081737fccc4d---81821266266.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/mpd5q103jr3jep28tovrok3lp6/52586057479.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/4223954417.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/8212911856.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/78024688063.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3a482f59e---mamawojun.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a087c52b039---58516070683.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210530081542.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/cd2bbbbc5624b0fa36c55e3dcc6488c9/53085251230.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/mupirusile.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/7b3724b7871c29b30127177dc9bacfd1/xuvuvewuvevuv.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/43552758465.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd07cb5148---tikidinivogafe.pdfIn PDF document text
    • http://feast.to/upd_file/zexowefuje.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/50997996721.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/womeposizudi.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075de817cef9---jepusubazuvorejimefo.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071342a6e568---99342240226.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/53245294812.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a32ddb1b28---50638058935.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/jasoxikiwipem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ccure+9000+administration+manualPDF 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_off00013d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001551d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1551D 18304 bytes
SHA-256: 9b33ae54bb7b870629fae8c5b3af982b9a5cb20b2dc9b23f4e01cc8ad1bccaf3
font_02_sfnt_off0001843d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1843D 10952 bytes
SHA-256: 0d656abe3ff85a6aadea0374585753a192b5fbd52ed38141f68f692eadb13258