Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fe3b4e25ec4a93…

MALICIOUS

PDF

92.7 KB Created: 2021-09-03 19:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb745eeb89097c3902a42ad38d0f871c SHA-1: 24285272f7829e8b6d67b37c277b28d4609a8dc7 SHA-256: 81fe3b4e25ec4a9392a743b1f5b985029005344aafe52a7fb65f70f95e47992e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, often initiated via spearphishing.

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://aadhaarretail.com/administrator/imagetemp/file/tuwugukirewureda.pdf In PDF document text
    • http://simsvizag.com/contentimages/file/nifazumo.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/rutalabimam.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/xitikekexagutuf.pdfIn PDF document text
    • http://terminsk.by/pics/files/78141340673.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/jajufij.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8ee668783---58888533185.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/48308320883.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d8476c35126c5ddbe9e722cfe742866d/lumuritesamuzuxamomixuw.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/jenelekemaderejir.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160803be7b4dc2---4760505572.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d768bfe54fb---monavetubupotilavosir.pdfIn PDF document text
    • http://alhs1973.com/clients/64426/File/ridodapogefis.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/p88g39qt10ci17m8c9824ehi9h/fevef.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609e449c5af33---81155380887.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/bulopenotenovusa.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/730bc24b833bdc03af33901932099061/29055666523.pdfIn PDF document text
    • http://a-pluset.com/userfiles/fatigexugutapejipo.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210804000816.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609747e01ff2f---gekitubisuzorudosoriziz.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/repivunokudabejusuluj.pdfIn PDF document text
    • http://waltonjohnsonfamily.com/clients/870437/File/jekiwizipoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=origins+earth+is+born+worksheet+answersPDF 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_off00010588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10588 17964 bytes
SHA-256: cc5a4937f09d9a19cf9b8e32ca9ec80ea84a0af2b5e913c31e301aa2e6b9257c
font_01_sfnt_off00013417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C2E 10684 bytes
SHA-256: 1b8d67dc0254a7033a146f0cab5187b3a8345539a7b6256c93ee95f104a5e3ee

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