Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63950a0a79831f8…

MALICIOUS

PDF

93.1 KB Created: 2021-07-30 20:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1bbd2caa9cd6ea5264524ea0c283d03c SHA-1: 735eae709ce3a53afd7efa00adbb534424028c89 SHA-256: b63950a0a79831f88e2f9180a25ab90275c9ed068fc933c974e132ab0f817b5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the presence of numerous embedded URLs points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://willbramephotography.com/81424974736.pdf In PDF document text
    • http://tourister.kr/userfiles/file/luzubepufav.pdfIn PDF document text
    • https://hiroyoung.com/data/files/16640085300.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/54768100590.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a774589cb8---tajubexujupebixe.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/59250524709.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/84391304337.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4b74ec272ec8ae021e4164df0a864ed0/12200845372.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e6beba091bd---xutefotelusetolu.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41fbc9b64---robexizagubewajiwojufeje.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/dalatumijolodexekipiwe.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/44799880733.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107050400423354.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/66614968554.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/93673125427.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b3c9a8fb89119f41d3fe2ed1ef00d99a/tulawodadufog.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e7ad4439d---8012828943.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/xexeputopa.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/22025843329.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/70235591403.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/l1k50l0i1reh5m03uhf4c4r39t/69333202066.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53ddb6a4d7---kifaniv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=is+the+economist+podcast+freePDF 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_off000106a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A3 10788 bytes
SHA-256: d35da04f7f3f4f9a619c34f9c7d1bc3c4c5580d94ae008e7e413504dd7c16e85
font_01_sfnt_off00011f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F44 17436 bytes
SHA-256: bf663a4aa033baebcd614f234ae9fd2f306d50348a9151063b34a96455fe4a59
font_02_sfnt_off00014cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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