Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1a7c42e6d78241…

MALICIOUS

PDF

78.9 KB Created: 2021-09-06 14:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e82eb724e9e181caca498e38e0fb0f95 SHA-1: 0d9e04639d04dfc31c78ca131c7254521c1f611b SHA-256: ff1a7c42e6d78241ac2f7fd00c9662abe8feeadc1a379d26380d70d89987d8f9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5399

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://ketchas.ru/uplcv?utm_term=research+title+about+bullying+pdf PDF link annotation
    • http://files.ibiza-ferien.de/file/38950419487.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1e67f3636345b9c63b4f3072ba1c9ff1/72902115042.pdfIn PDF document text
    • http://soflacops.com/clients/83266/File/57417296518.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/tuzutozuromuwoga.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/4ad3m2r7piq1e00ho51b585i26/9755941684.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160fe8571a1222---fezosojalufetoretipuzomer.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/2jg3ji9c65i8fs7mc3tvt9uto6/kidoxatu.pdfIn PDF document text
    • https://scalper.ir/data/files/file/fimamineta.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31937f0b5c---74752396011.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/af2b6849f5f131624f91eaf9423bb0b8/mifitadajazubo.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/luwenusinosuwekezesin.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/3846733629.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/jazikelenadevukif.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db873475955---vilisalitogimidujaropigew.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/92508709526.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28b401a2df---1801913344.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/38711589501.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9df6861af---7137398639.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/vs5s79i0d4prhp34ugs1lqb3io/92499654198.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072afd4586b4---rowaponudovekonisubal.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/pawenujezajagasikedefofi.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/42934834323.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/jexetosirexo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/an7ua1lidms53rj8l66s79rd14/71077330558.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/28333626482.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/kibebubidevivagode.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 18520 bytes
SHA-256: 427645b2e8120d280c7d474c4f689d56ecb999bd4e7039429af01bee946a5c64
font_01_sfnt_off0001197f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1