Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77d5af4c8ba1de3…

MALICIOUS

PDF

89.6 KB Created: 2021-07-15 17:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b6532dd768255940f0f50d48984ab734 SHA-1: ffe3535119ce86a153cc14d65a750b73ea75ba1b SHA-256: f77d5af4c8ba1de3dc266df5f4f201d9f86d8dd80c2b4ef41a7dd586302370ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or malware distribution attempt. The document contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage, suggesting an effort to obscure the final destination. The presence of urgency language in the document body further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://ferrogep99.hu/static/media/file/ledofodofu.pdf In PDF document text
    • https://moto-trend.cz/public/files/fck/file/94424640590.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/gisufunuzojuruvetoro.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160acf4526f673---mojomemo.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/o44n16c0s6la1v7s1hg83u3cr6/dovoniz.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bca66d4ff6a---50707180144.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/78009377076.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/54421393806.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903f6b47c69---jezonixujewudo.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099332da44e3---xidekolerukurubipiv.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7e492b49b---wuwegemunoguz.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/4aga3qnkj106jc0h9391aobfcu/sukolobivefireguriditagi.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/matilabob.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e8jf2rr0o4asugv2318753ieo4/sogipobulububevama.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/moxuku.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608090fc59ff1---wiriwexizakujere.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/18160014832.pdfIn PDF document text
    • http://vhktn.at/images/content/files/82066513937.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/suvuponagile.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/96316279202.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac8136a9521---80645534262.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160de4a1f22580---risag.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/kururi.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/13393537473.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/10473546647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=all+types+of+contraceptionPDF 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_off0000fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 16876 bytes
SHA-256: f2bcb3e63d1245587f32a3e0208e2ac3e66e7a0f0c1d1bcdf55cae3ac6d46372
font_01_sfnt_off0001290a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290A 10568 bytes
SHA-256: a5fd8db369c299f4c478a323845e0069df6e693b23e554421feada9cf4f26440
font_02_sfnt_off0001415d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1415D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1