Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c20311fc1b3f63…

MALICIOUS

PDF

76.1 KB Created: 2021-06-26 00:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5353dde03ded598859f2b9587eeecff SHA-1: 4337d1a11c5e66f06f2cfc5951a9f43d517b770c SHA-256: d8c20311fc1b3f63d54d5a3dc8b5013a76d8bcdc0af92fa0f3b9c66a7873122f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k6u5q72pq9cpfsftb4d360mi10/lodetiridekekonoze.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d2dadd2c0---57593280166.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/9ev3f7gddlda0p1auosb53nt04/88221623444.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160af0f3b10a0d---dasokojumesatalekuwafak.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/32b1841764c03e4a0cbb27a57da3867f/63032325511.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/093542bc314a722f2042873ee3e8bfa1/93536509451.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16083f32a8a768---35779539513.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8c3b4096f---11005092455.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b53c1c8651a---36093310079.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50344780e1---wasowupazolufobiwavimalo.pdf
    • http://barcabianca.eu/upload/file/54305418647.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/cee0b74877b3e089a6baefd8044b07d4/zunotolepomovezuwig.pdf
    • http://andlupa.com/userfiles/file/77642954168.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608693c3f13bc---jadebinamotilegejobad.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702cfb4145b---8882039581.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/2b6f1cff1ffae2333cc25a6b395e3308/90325869729.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/5f9e6b3d29674b6050038b5bca4b19bc/vosekiruzi.pdf
    • https://lawina-radom.pl/files/file/nugekasonagavogalapa.pdf
    • http://change4best.ru/upload/file/sinexagenujid.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bce0a249e22---xodejidumetiwipugawa.pdf
    • http://aitrans.org/UploadFile/file/F1202105170744504251.pdf
    • http://asja-doll.ru/userfiles/file/14306708045.pdf
    • http://asianmosaicnyc.com/userfiles/file/jexum.pdf
    • https://hgb.se/filer/file/warufupuxesalenomikak.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=on+the+market+rent
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c97a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC97A 16792 bytes
font_01_sfnt_off0000e18c.bin
9de4ae606998429a79e255f86c6d39885956c74ffb2eb8cffee0533a89df6a47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE18C 16760 bytes
font_02_sfnt_off00010d0c.bin
0faeae9febf415572833dfe5b0a8affc4ab5761a5158457f536793595a04eac2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0C 10064 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.