Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b90f4d073f9c06…

MALICIOUS

PDF

96.4 KB Created: 2021-08-15 08:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 742e1ad9e79ea9ecf7b2a54030913a2a SHA-1: 65b306f9fd035d78d51517c7c5af5d95b7787a6b SHA-256: 19b90f4d073f9c0618c93b7bba851fad4644e76d604149cca50419e1146eadd4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://antansconstructions.com/ckfinder/userfiles/files/bodudur.pdf In PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076249aaf953---rufopatigagivun.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/5b9775a9a608f9751e9491d2153556c1/gegurewifuwogamimoxa.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/mnvm1nbu3evqajbfq93010fh64/77371304613.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/zalosudini.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/xajufize.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/tapaxokuxujavesisogaxaju.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/28932061254.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/47008005115.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/vepenirakazogujokogeja.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/46951375528.pdfIn PDF document text
    • https://ms01bet.net/contents//files/90795135062.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf333a58890---ximenojulorenobiwotoj.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edad92623cb---balipisaxuzidojaz.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e42ca6f2ac2---19006254447.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab76ac77ddd---1204054033.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/uleahhhf1opfklbkfb21pklulc/53647743806.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608044146e0a0---98258173302.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/1d3380dbd9f928ab11318e5ae3cd2b55/70593600044.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080a1d10ccfe---jewefelumenesokatidixo.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/kidiromoxebu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab13fe18d13.pdfIn PDF document text
    • http://wakarusavalley.org/userfiles/file/66507921332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=arbonne+30+day+detox+food+listPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 16764 bytes
SHA-256: 4259ca0d7f9336d760f5882c4527f0a37afc9a1ed0d8eb0abf7a6f2591062db9
font_01_sfnt_off0001128f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA1 17716 bytes
SHA-256: 7ef8dea95ce11b9a4bd719f98d38025cf658ace21add7ccd0e1d5810ba130713
font_03_sfnt_off000158f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158F5 10976 bytes
SHA-256: 90b41f76dc8ba25bc4ffbbfc053b8d1f493f9a9fcad67aaf92dabcc0ec3dea13