Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a599d43d1ec3e9e…

MALICIOUS

PDF

82.1 KB Created: 2021-09-10 02:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9056bc1dd01a5cb4e859f547fd4a7e86 SHA-1: cb5dfdc8903c919275efdece2bd10ce884bdb8dd SHA-256: 9a599d43d1ec3e9efe19bc4db5bba8e8361e33be9f21d0ee6b07aa52e51f9636
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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
  • 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://synerhu.ru/uplcv?utm_term=ufone+apn+settings+for+android PDF link annotation
    • http://jan-fotografie.nl/upload/files/57706558595.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/sazemamab.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/vigefiditifidoxafatuli.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373b161cbb4---81586338129.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/15833513646.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee3fdc9078---26745812404.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/23774986937.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/rumuwerusuwibevojafogi.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/83025368303.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/6017983386137e091ae8f2.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/lizubobasubiwuwavi.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/zenepen.pdfIn PDF document text
    • https://cartolmania.it/file/2230782773.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161388a688e719---walakesapebaw.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/mevowokebepulisi.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/nebeligomagubolo.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/67615063624.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/16310881261.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/16450036182.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/55518183579.pdfIn PDF document text
    • https://eetravel.net/file/15757346812.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/fowogeb.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/pejodikegisaw.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/titigexagalimelitapagosor.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_off0000dbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF2 10632 bytes
SHA-256: 9d3464dc8a93fb34cb5120f38efb7c9aaf98e7214a72fa813a2ad7121389a4b2
font_01_sfnt_off0000f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 17796 bytes
SHA-256: 96697a4c60637b1deca3a8cb92292ed341da6485ea4a7052dc4845ce0d268d77
font_02_sfnt_off000122b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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