Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4818dba0040e52…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 06:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df73db2d5f01784ba039cb587672d292 SHA-1: aede5b990f8d6cb83aaeb77f3f5659a71a81ae3d SHA-256: ba4818dba0040e521ea1e84d0e1be9054c22d71bc0491ddcf933079f63d7d1c1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to prompt a phone call, a common tactic in phishing and tech support scams. While no scripts were explicitly extracted, the presence of external links and the callback lure strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=cheat+code+last+day+on+earth PDF link annotation
    • https://eyetracking.pl/userfiles/file/66477175868.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/toxoju.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/30647140876.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/sidagajoxotugubadevivad.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/gusefijepagapu.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6137242140004387393171b118ca0c13/74873890016.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/41043709124.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/vexevebe.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/27064372686.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/nelonopoketa.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/97468492497.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/26752544399.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/xevebisajoxoxotufojuta.pdfIn PDF document text
    • http://venkateshservices.com/uploads/35532900160.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/mujebej.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/2947161956.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131038346809---48650763138.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/sufiguris.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613024711b4e3---10476965172.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/kenetose.pdfIn PDF document text
    • http://rem-proekt.com/f/file/rowegijusupolijur.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/gixin.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/gebuzetotul.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_off0000e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 18404 bytes
SHA-256: e749e08b6281e4013d6bcb3013d99be9e0b8bf9d33a5f155b77a3aba79cb1f75
font_02_sfnt_off000129ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EE 10520 bytes
SHA-256: 452ebbeb16016af5799cecc6194101286556215d5de16ee982c703aefc3bf00b

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