Malicious PDF — malware analysis report

Static analysis result for SHA-256 8221ba4605f670af…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 19:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fbc4b8e7136da7a32c189232cb29e7d7 SHA-1: eda11b11c52bfcdf6f1c75ac4389fdb1370fda65 SHA-256: 8221ba4605f670af8d10483421d6faf2d6b271912087fde24f28bd5d2dc7b17a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing or distributing further malware. The presence of 'utm_term' in one of the URLs suggests a tracking mechanism, often used in phishing campaigns. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=how+can+i+remove+my+email+from+my+phone PDF link annotation
    • http://rent-lease-no1.com/userfiles/file/20210913194519.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/34442581872.pdfIn PDF document text
    • http://effektfilm.de/files/file/40391248048.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/15031667969.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161479a22bf2f8---zefevupabuvud.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3db98710d---88533351825.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/44779835213.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/62139934778.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/woxatipunej.pdfIn PDF document text
    • https://jin-ji.com/upload/files/57938661787.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210907_E7B57A2A0E8564EC.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/xuxatilurakonotisusifol.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/30246400188.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/pirugirijawusole.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53094cbb4---jaburewakepegupotazijex.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/sepenudizulekavogupikuw.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/zusaxolomibano.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090405525980554.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/43719340038.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/kanejiwimatel.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/dovaxexukoki.pdfIn PDF document text
    • http://gzmingjun.com/uploadfile/files/20210916_043654.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/fabiw.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_off0000dbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF9 17656 bytes
SHA-256: 1ee5bb09b75dc2322432c8096378bd8ce87b59e5308123c19ee6738850629c14
font_01_sfnt_off000109e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 10736 bytes
SHA-256: 704a8e74edeb4d14e2cff3d11ad573294680debcf2f3e4e26dc43c32dfe9088e
font_02_sfnt_off0001225b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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