Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df62adf98701c01…

MALICIOUS

PDF

91.6 KB Created: 2021-07-07 20:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 996ed407133fcebd140a042643dfdbe1 SHA-1: c570b9ec546d7124d85c2fd7d2449fdcf50e4eb0 SHA-256: 4df62adf98701c01a4b3aaa4c9397a9c505b9743e8cabc197c8db88454484625
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. The heuristics indicate it functions as a link farm, directing users to various compromised or disposable hosting sites, likely to facilitate phishing or malware distribution. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://pixomot.ru/uplcv?utm_term=how+to+copy+a+pdf+to+ipad PDF link annotation
    • https://china-glass-mosaic.com/userfiles/files/20210619_141507.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/32562532875.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54a7808c29---fibonedapubanemu.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/85489571807.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/63013869340.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/n6tmtgohq7tb6n8ll8hqli36d5/lesemapi.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/f9fd845e3bbec0f85a339dfce41c0a2a/kulerapoxef.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/e2p0fvsmucbgtd2av8a8or4cf2/namulozaroge.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/e76c04ef35df8bdf01ecf7acef980f9c/pajigobenurupuvinu.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/bozejeximipufawapudi.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/85497290241.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216304474515.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9972324e3---jegetamawigomiwibikito.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e303c88d90---37940661890.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/tinidimebevul.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/s1ti3uihopn37pk24mraij2gpe/pezegexitemanololabe.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/dorowaxop.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/bipexerekesemijawibe.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/bomip.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/egvvcp58sdnqm4ndsm0h7vi3g0/1122793367.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec433f29b1---47883640855.pdfIn PDF document text
    • https://capecoralliving.com/media/file/xulelemolevotelomeligexiv.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b060c3523b0---29673385640.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/mokute.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/743vupfdd9kobrk21oqccoc5vu/jovilow.pdfIn PDF document text
    • 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_off0001023a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023A 18052 bytes
SHA-256: 33283db8faf13154cba0830269c116a34b9aa04e3502bfdadca119d4be9604bf
font_01_sfnt_off000131cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E4 10252 bytes
SHA-256: 33061885fada074a56aea490a9546ccc58cd8352a639df7d6988883f3a876ee0

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