Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a949e8c06c183c…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 16:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 802635692a8f1bf76baaf9744eec8a2a SHA-1: 717b7ddbb73692af0566e0619c2bb1737b682283 SHA-256: b3a949e8c06c183cc177177cc7a65ea4b990e4818da1b37d42fb119c9d439552
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. It also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://netiko.ge/img/Data/file/fedareguxavewunux.pdf In PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608820e2944b2---31229320388.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/28699267563.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/rabasojanalanu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa65588f52---24870177149.pdfIn PDF document text
    • http://surtek.biz/image/files/20150320_074910.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/vogekixirex.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/82749604073.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/47614921931.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611a3fe138d83---32386741794.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab055bd98b---norajazoxake.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/23728381656.pdfIn PDF document text
    • http://etkenkalip.com/files/niramub.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/f98c07361202af26b98ba6d1628b2eae/vuwetulopu.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/72153027555.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/875epcgbeorag27uovr0r5aq27/xipegekugumerinu.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/27715604106.pdfIn PDF document text
    • http://zerosquareonline.com/file/datawod.pdfIn PDF document text
    • http://orthopediedelft.eu/files/75841076705.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/a8c2cde76499ddf23a23ca4d31bc7097/pirusi.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ca48565ec---33001937844.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/xagiravegofevewajurozaged.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/guvudujokulizusumuru.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/408415cfc1fa0f66a42934af0b0b5181/91856426642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=approximating+area+under+a+curve+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_off0000df8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8A 11344 bytes
SHA-256: c2c87bc8d3d8daf6f39e11cbe4d17a65a95d0175b375f4b087373b1aff04decd
font_01_sfnt_off0000f9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001120c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120C 17220 bytes
SHA-256: b69e3dcf675fe4b6b091f2fd7a1dfa87cc61764b21ac9e6ae37d4bf7032425e7