Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bbdccf0aa3e978e…

MALICIOUS

PDF

97.3 KB Created: 2021-08-11 16:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 53a8e841f1910939301bfcb4cb5ea397 SHA-1: 935c2bb93fa45252c356365eb2f16f12be3ad966 SHA-256: 3bbdccf0aa3e978ed063ebe6e0a9928db8d1429b32c8f3bb3fc45c17337db6ab
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites. The 'SE_CALLBACK_LURE' heuristic suggests a potential callback phishing or tech-support scam pretext, aiming to trick users into interacting further. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crysiq.ru/uplcv?utm_term=how+to+make+tree+in+little+alchemy+2+step+by+step PDF link annotation
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/5d977f74ac2f504cf6add5ccc8d856b8/33857053759.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/69599529163.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/bitafefo.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/41075468527.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b16e24c7---65756748501.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/qr6q2jc63oc59tl6gipidabg74/xanixuguxumizojanavi.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/61270589333.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/64788715025.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607501b9c8b29---getolasagote.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/11451060118.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/nawaxosadamesofisomuxiti.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609104ac1c7a3---gedofapubedejaxu.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160817d717132e---kuzanumuwiguzivibag.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c601b250db6---99070073207.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae694a7dfc6---57106344329.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/ff5efca626c6e8b93d61e3170b2770bd/mudareritorodevotusaligex.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/semewoxafoze.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/likagodemedaxodifupevaze.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/gikutotisupilum.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/brdbh7fljhv7o16cnqa0vcq40d/jepovapebadipajijafuvap.pdfIn PDF document text
    • http://cocoal.com/uploads/file/mibediwar.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/dutixufi.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/5648632576.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8037c5a1a---badolufupeginaxutu.pdfIn PDF document text
    • http://minicabii.com/survey/userfiles/files/89510579495.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_off00011618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11618 18224 bytes
SHA-256: 85adaa3e05712916d792cc35895a8479ea7d8c9c7810ae6a90e901cfded1f89b
font_01_sfnt_off00014521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D38 11180 bytes
SHA-256: 5e7f5169e7532d8103410e1815f6ef158cdff55602de67e0ec89cafd2812a50d