Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d82df8ee49cc81…

MALICIOUS

PDF

90.0 KB Created: 2021-07-01 21:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d300c8cce15f3bed17a3c6713ce2d14 SHA-1: 1a42326d4eda9183609d11b77883894353e34864 SHA-256: e1d82df8ee49cc8109d800be1b70d4d4d41935e71ddefdfe3000442ba46462e3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document exhibits characteristics of a callback phishing or tech-support scam, prompting the user to call a phone number. It also contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://catamma.ru/uplcv?utm_term=setting+goals+at+work
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/6935033f5b8c3972876c156f0d0c26d6/74982170834.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/9bb1bb0f0fc0177af05f2d237c34a203/81188485906.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b69e753b2---16849004574.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072106a96b67---78190317908.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/8005d871a6b4ccf4d264d1e39b93c0ca/19190987771.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/blejen1t31p9nkmqbc3p7bu0e9/kexewujojefake.pdf
    • http://divorcefinance.nl/uploads//file/69096894214.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077aab37dd90---47722622504.pdf
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/rutogokipudiwejut.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7d86680b3d4e92c2746e1ba80de82160/63306321955.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d9659d9658c---50395781798.pdf
    • https://cplastik.cz/data/cms/file/18342630151.pdf
    • https://airflow-skateboards.com/upload/file/27139668176.pdf
    • http://wsm.hk/images/uploadfiles/file/bolimogudolabuxolavoziden.pdf
    • https://eastmanllc.net/ckfinder/userfiles/files/6640114153.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740861a8752---41177175956.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f2395583---xidoxaged.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f941c5c37---38925620140.pdf
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/25326330364.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/cebe53cbed82b39f6ac3d9ccd99803cc/45559631279.pdf
    • https://cuacuonbentre.com/upload/files/94401196169.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/2e3d1f1a4e43374e5d3b614d16b00d6a/93785442037.pdf
    • https://villatoscana-pi.it/userfiles/file/8759131452.pdf
    • http://z500.si/files/gavokafebivapirefawuw.pdf
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/kakiruwodubosajegemorasut.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc41.bin
bea87c7408a20844d13f42eac6d6d7c26853f3eaabd3feb13b24a9ea22221c18
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 10536 bytes
font_01_sfnt_off00011472.bin
601e8b8f3f31e2e2ecc976e5566e2172b57a7f62c09a3d6e910a268190dfd458
pdf-font-stream PDF embedded font (sfnt) at offset 0x11472 17320 bytes
font_02_sfnt_off00014152.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14152 16792 bytes