Malicious PDF — malware analysis report

Static analysis result for SHA-256 8105ff17a864dd41…

MALICIOUS

PDF

87.2 KB Created: 2021-07-01 13:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1f4c7bb598775c4667e1783152a246f6 SHA-1: 38100892673b073143072eb95c8d4e6266bcbf0e SHA-256: 8105ff17a864dd4158a5d09ed74f841ee92683c4d7d5327a7d62d15205c562c9
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The presence of these links and the overall structure strongly suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607720f440847---59982039264.pdf In PDF document text
    • https://luyenthitoeic.info/userfiles/file/38534228666.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16083511b5b8a6---30635867794.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/78142729603.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0a062b29c---masagunotasagesodidefexa.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ff0ca4b3c2b4877870dc90a32ccbb123/gokum.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/qnnd1alctsjuo22eoaecp23rbk/kejepimovibazes.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/6780f5858863cd8d92a9b71934801459/tokowi.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d32eeca8a6---sezubadafidabiwon.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/37623492592.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/3364913378.pdfIn PDF document text
    • https://menu2uplus.com/images/file/43023287884.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/70916057258.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c834bd65385cd3653ad2213d30d0d01a/wotozoti.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/99059819033.pdfIn PDF document text
    • https://primer-spb.ru/files/files/28532703045.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/be064d1918877f8a12b34d8f535a7700/silaferobeditusawufamil.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/60307691733.pdfIn PDF document text
    • http://expresskaliski.info/file/53172355237.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/brmtjcfl6386reh4imuvkj2vp9/gomitese.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc23a844b3---45862217695.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/36983747013.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/141afe017dad15e758a5105be0f9c8d5/5583119893.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/vaneseb.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/70116403442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+mix+a+skin+tone+with+acrylic+paintPDF 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_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 11024 bytes
SHA-256: ae1a5138a3bfe76c18168608a75d911ab169d3f484272452557f50b7349ee380
font_01_sfnt_off00010e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12625 16128 bytes
SHA-256: 3cca2156481c9ca0dc7c0a387d0acf10f504bbee9c2bb49588c59c479c8c74e1

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