Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7ad6a0cc54d746…

MALICIOUS

PDF

74.4 KB Created: 2021-08-11 12:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a139a00e1f3148f4941d7398b81ef796 SHA-1: dac1e7732beb5b104c0252a3b48b31e8cdcb7100 SHA-256: 0b7ad6a0cc54d746290a798a4cfc0479b9bca34ac418244ae1c21cd38b069e87
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://guapa2.com/admin/fck/file/vobukug.pdf In PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/le2o7dencemvbfmupb31dtcjas/medoweputog.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/99369855725.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/pibavidowat.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4270a9c87---rirumixezerakaguzotirer.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/kezob.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/vekuzuxevemij.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/safizopebexavadivakosigev.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41ee3aec6---bafopenisopamarogejawose.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc10c3aefc---bozex.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/86649195848.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f13c46e6c---zotim.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609648d10201c---bexibejizujovorejevuw.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/oqa4qe9n8emimc0r75pas1i2m2/ranew.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/0685e7f0d83c4b56038d49b8ff4948db/xevanifawifositat.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/f3ea37085dd1f4fd7ea3643fcd011222/28718692886.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/fexijudimozowiwitu.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/48029252700.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/kesav.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/zazotefonusipasevu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c687b30ec92---dirukomebujof.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/6145711059.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/4878695069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=xiaomi+airdots+pro+user+guide+pdfPDF 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_off0000bb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AF 10800 bytes
SHA-256: 7c9841b80ce45809eea33b8241c9a6e8dce720c5941c03e8674219b20185c658
font_02_sfnt_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 17924 bytes
SHA-256: 3bb85c63625b2db134bd6ca698305deb26544511f0764a7e39899712b9d7421a

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