Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f17a9b6ddf8bff…

MALICIOUS

PDF

69.7 KB Created: 2021-09-09 16:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 134eec823972b94ef65c02e7ca077309 SHA-1: 701cb393cb65a2d9b1d9687fb87600b3b9879500 SHA-256: d0f17a9b6ddf8bff859c386d7c2bd7d6cdd124a5d6925e337031f945bb7b7307
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://magnettoptan.com/upload/ckfinder/files/57536918053.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613785692ccaf---35841228287.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613560c8c101b---83429794375.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/85898687386.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/34985279115.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/86796695340.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/jedifulifisezisif.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/24313059081.pdfIn PDF document text
    • https://hiroyoung.com/data/files/fasix.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/69719461408.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/dopetuwazafizibimodij.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/jazonexezaxozowivoxopuba.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/lemedu.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/66612794104.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/panarowufodixot.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/bokuburigopi.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161318f8154f72---87203471201.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/36443393872.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/xarotabimomimupajexafu.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/85495657993.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/danizu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7750999da---82586133859.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/mafafofa.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/gexenobekuzaf.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/56922228171.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/67620330018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=happy+restaurant+cute+edition+mod+apkPDF 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_off0000b25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6E 14912 bytes
SHA-256: 2cbd330162ab2d1f38180a8a6d3688da4564b84435b809bca5d11666c8f504de
font_02_sfnt_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 10928 bytes
SHA-256: 69b2948c310713c1b34a25fff52644a0c396a0e93d99f855af6523102b4d8c0b

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