Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f07083e5302c4e2…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 06:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 389889907b5edbc828a569b7e30a3156 SHA-1: 9dc00c0db3b3ef03f695d1f2bfd88cc469dec075 SHA-256: 3f07083e5302c4e25569fc0678014f3a3ef87fcab88cf4a4af3648feb734b76f
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs, including one pointing to a compromised WordPress upload, suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://occahomesearch.com/userfiles/files/42907961101.pdf In PDF document text
    • http://theloanwala.com/userfiles/file/47000734962.pdfIn PDF document text
    • http://jsdarvin.com/files/xomezabup.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/13129110391.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/81665421805.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/suwunelumevawe.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/piwajub.pdfIn PDF document text
    • https://el-tall.pl/pics/file/noxigiwo.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/93682367218.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/wakub.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/lenanixezumupogivavimone.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140394c996b3---39556595058.pdfIn PDF document text
    • http://4bx.pl/public/file/ditivabevovoxakaxa.pdfIn PDF document text
    • https://polytex.de/sites/default/files/xinawoweretevadademiralu.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/41258468128.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161372267c414f---63289621580.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mazilumubigofufu.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/jegomedazebawajotogaba.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/debedazimezopexenob.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/41114656354.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/80055220901.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132e7f5ea754---32309610180.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/69370369772.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16141ba0014f38---zojobo.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/4527272094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=kinemaster+all+effects+unlocked+apk+downloadPDF 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_off0000d980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD980 16468 bytes
SHA-256: 0deeaf6575c76fb6a8fd431bf83ba5318f10b4e6b2926379a02a99b93b35ceba
font_01_sfnt_off0001040d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C24 11052 bytes
SHA-256: 7560a33e3e02733fa73206ab8f12a4be7afc5aa53cfb079ba3f4e7e0fee748be