Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7c21a543b1a216…

MALICIOUS

PDF

80.8 KB Created: 2021-07-01 20:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94261df5d062b086c4da3dc71c3875fd SHA-1: ea4adf7b95f66bc9fa6927a7db10088bff184c25 SHA-256: ab7c21a543b1a2165cf209d0e08319554f7fd2de4ab2fd84afc642dfaf531fcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the overall structure strongly suggest this PDF acts as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://irlanc.ru/uplcv?utm_term=2000000+huf+to+usd
    • https://sce.tw/uploads/files/60c3300062ab0.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/9jiseddj9aaq83cdrmhvmcmso4/6008537628.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b404950a532---80817296164.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/h98lcqhbetcer3k7628od94or2/mojabapelamusitenove.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/73790f006b93b50f6448a7e9388c59d2/75248428609.pdf
    • http://msslink.ru/userfiles/files/82602531379.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099de058df69---98738740614.pdf
    • http://arniestribu.com/campannas/file/59159890050.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/cd6472709de97fb3543497161e011a7a/82280035081.pdf
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43166763076.pdf
    • http://eko-inwest.eu/upload/file/jorob.pdf
    • http://chukysovin.com/img-svc/files/nitikovepinirerabazuli.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa7c408994---44496381521.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d9d8e1367---kedapovukevuviwoliwuto.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9e94c7b1d---84077443996.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/330605433a6aba12f3971e4f1eca9017/doworidesinolipabuzurate.pdf
    • http://sage-chem.com/image/files/20210605_184215.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/810c21860bc6cd221f827f14324fa326/gatakogozupelozefefowotik.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092f2e6dbbd6---21384223237.pdf
    • http://sushiloverca.com/uploads/files/26921931566.pdf
    • http://happysmilecard.com/uploads/files/zasolusoraje.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/02ddfccf64bff58b4c0d3dc8ee89b96a/16075304943.pdf
    • http://phrabat.net/UserFiles/File/15725039578.pdf
    • http://tokyoracing.hu/userfiles/file/82825744944.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be48d4cd922---34890827379.pdf
    • https://tresonance.org/uploadfiles/dunugesusafuzupusoroforok.pdf
    • 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_off0000db9a.bin
ff94eb27eb9a8ba225ca6e33a4d4c5ed0052bdad7261f9c70f9de89e663e684f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 10060 bytes
font_01_sfnt_off0000f221.bin
bf2aee57a45c2c0710d78c3472c9cc37e1329007a1d93689352f273ff65aa3ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 16728 bytes
font_02_sfnt_off00011df5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 16792 bytes