Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c175dfe5d8f0ab7…

MALICIOUS

PDF

137.6 KB Created: 2021-09-02 10:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1db4ea231f5c52ae318f0aa04836df99 SHA-1: 6e868ed590aff16a857f847b0ad370fc6ab34c1f SHA-256: 0c175dfe5d8f0ab75b78807391aec2028e550e44371c1bc7dcfaf2d19ea68eef
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of SEO-poisoned URLs and links to compromised upload directories suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.adarshvidhyasankul.org/userfilesfile/21328064326.pdf In PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c0b391875bf2fe1e57484317ff409093/rubiguwonajebo.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/xerefozopedaruverus.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/56988994173.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/93020871629.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/49292624937.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609269ea1a394---jajisalibun.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210802_46278EC5CBE4CF25.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dad49987bd5---soxititususoriwor.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/zelomovenu.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/92861461848.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/nitutuxoregan.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/zuzugosimejexijusape.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c7317766---litokise.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6669c99eb72628e243e11c2f023ca966/47236708309.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/pukoberikal.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/74913400347.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/nofur.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2f7a5d11cde0f411fc47894cb3258597/fixolanakivegorodagusi.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16083fb6e14133---47342270849.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0ade579c6---waregafowug.pdfIn PDF document text
    • http://unseretochter.ch/images/file/jasovamisuxugol.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a86ad811bd1854e7b15f06bedbf5db42/wezekudap.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/34b80fdd39990c0b39c97f1aff7307ea/gebutesavetigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=delray+marketplace+movie+theaterPDF 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_off0001afde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFDE 10640 bytes
SHA-256: 4cf3c593a20dad3cfb4bccd66aaad166c0a5c71c88cf7f85c6c92e42b20b31a6
font_01_sfnt_off0001c848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E05A 21172 bytes
SHA-256: 00d9a8370f78a308db5b50d729fb05644d8e8b4d44607ea5499732bfed1209d6