Malicious PDF — malware analysis report

Static analysis result for SHA-256 720f897c378c98b5…

MALICIOUS

PDF

68.6 KB Created: 2021-09-02 06:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22faad99901f41fead8b53806e9f5557 SHA-1: 56f4c404eeb15e238dbd33f98d5a8b2c2ee35fb8 SHA-256: 720f897c378c98b50f104ed3f2cbf9722e8ba55389e8f2fbf25fc61a263a1366
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. Heuristics indicate it's an image-only document with action triggers, typical of a phishing lure. It contains numerous links to external PDFs hosted on various domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and unreadable, further supporting its role as a lure rather than informative content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://amirafouad.com/uploaded_files/file/61189965612.pdf In PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/wuwavuvivuwogigevivap.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/jupofexejekuwagufovotizuz.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/qv1irb606r155rd7lvi929ndnh/94542414569.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/getugedugirinot.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606edfb81196e---64657503521.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/zusugigopurizodewilifixuz.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/16001918811.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/nosomofu.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/4c325d624a03ff389b22bfd56bd51554/zegekogojomuleri.pdfIn PDF document text
    • http://unsersohn.ch/images/file/dodixoxupufibomuvafuz.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/q1h0408vu2oukg7jc5g7j1m4cd/22384827305.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/vp5hg3ioro2firk94ef300vblf/47477686259.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/92794452972.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/gopokobalunemutaxizisut.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/jijam.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/12759964939.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/vafawulosajeguj.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0893ac0da8---47137191949.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/ganawowin.pdfIn PDF document text
    • https://bursac.net/userfiles/file/lojiru.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cf1c01a53---wuvasedejuruga.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3eb2c0f283---64570631127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=need+for+speed+underground+apk+androidPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/15165391882.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_off0000b011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB011 14036 bytes
SHA-256: d0412c9633d09f681d0e1998ce09151d8f7cce5dc27ce330fe96552324a5163b
font_01_sfnt_off0000d298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 10700 bytes
SHA-256: f80e59f0c6bdd3b0e2705f592f9deae34dea09dacb21f5cc9663b81371f520d6