Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c376071715807ac…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 14:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff7da1a4c71661c108ff87f26c4e04c2 SHA-1: 246043654ff8b609e502f53f440c4296a4a2c30b SHA-256: 6c376071715807ac6ed1e9dbdf4ac6fd8487b7c7f0dbee2f82bc5e92498b4a01
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting domains. These links are likely intended to lure users to phishing sites or download further malware, aligning with the characteristics of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://dienlanhlongan.com/upload/files/merogikaraz.pdf In PDF document text
    • http://sjar-tech.com/uploadfile/file///2021092419452342.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-10/20210910211251483531.pdfIn PDF document text
    • http://mylodge-naoshima.com/15106120270.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/sigokigojobebibul.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afff6ecf83---37903973066.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/siwizu.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210912152558.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/nuwakunumuwoxeworobirase.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b21f26dffd---jegisufepuvopadaratukod.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/bizorapebejadagekefixa.pdfIn PDF document text
    • http://devison-matras.com/upload/file/53709760649.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/41741965748.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/65098004001.pdfIn PDF document text
    • https://inarsindbari.org/uploads/21378349819.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/duvazufap.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7b7a43dab---12617527820.pdfIn PDF document text
    • http://net-marketing.hu/images/files/11820500730.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/74480203516.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/riwukese.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/bifanix.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/wulege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+weather+app+2020+androidPDF 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_off0000adbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADBC 15256 bytes
SHA-256: 5fc16d2d5ea5464e072bf0a46f91852675112d22b31cf89ff817569b3045265e
font_01_sfnt_off0000d462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 10824 bytes
SHA-256: bb497a854b7002b1c24b027f6a9136b14e7616afb2bc9c6aa40daad61ae121c4