Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd847283d8ed54be…

MALICIOUS

PDF

85.3 KB Created: 2021-10-06 20:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: acf02aea3462e7aeea247fd99dbe433a SHA-1: bb5e428c86650c2dc6e55d28c685638c5ba8d181 SHA-256: fd847283d8ed54be5503472deb5c02312511c3f5a0d101d7ae484c838005e43a
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains embedded JavaScript and a link farm pointing to potentially compromised WordPress upload storage, suggesting it's designed to deliver a malicious payload or redirect users to a phishing site. The presence of a callback lure heuristic further supports the phishing or tech-support scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jlm-kg.com/uploads/file/12615272427.pdf In PDF document text
    • http://888chji.com/userfiles/files/65931356978.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/gereboselunulevopugusuj.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/54497710973.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614e81743082c---mowara.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/e23dc1afd21b04a0003e154fea564890/dalazukoxamomowelegotox.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/pimububejisobavoraguzunun.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/filokotiji.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/wodovupazijodesuzojijaxow.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b65ce609d0---fijedi.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/bodojarimexetamijiwi.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/80735374137.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021092307182939.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/65836067969.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/87068155748.pdfIn PDF document text
    • http://alcantara.cz/data/file/sizubemobuxafufedo.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/sixogovotalebefupazutexoj.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/65005521174.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/mebaxuf.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/59932392429.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/46431111394.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/vekadozisil.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/44564274210.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/rixasowowatezanarog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cute+colouring+inPDF 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_off0000e615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2C 10204 bytes
SHA-256: dce94479b6acb3f1522116c4901fdb8c01fa774c977238460a22039addc7e700
font_02_sfnt_off0001152a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152A 19524 bytes
SHA-256: 4e612688fd7dd5d5716967362f8ae3cbdea95b0cf93013823f49c3282916fc5c

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