Malicious PDF — malware analysis report

Static analysis result for SHA-256 3129a9562fce3db5…

MALICIOUS

PDF

93.4 KB Created: 2021-06-26 04:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82d3f1f42e382db52746448856ef5c11 SHA-1: bb507e9ff159f920e99a60e2bd8cc85dd1da94ee SHA-256: 3129a9562fce3db5cfa65694a492b230a956d5abe755e5fd0a34f1e04ff7e10f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and link farm heuristic point towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/adc84eee6915359965da02a6500ea9ec/13763619467.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9bd2cc31a---28172493651.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/dfe389193eef943218d4d1348995efaa/xidenuvubenakifam.pdf
    • http://thedreaminitiative.org/Content/Admin/uploads/files/92510682639.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/7639b66a9eb5d0ad4afc16e3b2f8b65f/48927829759.pdf
    • https://morabia.fi/images/file/muvexuwegiz.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/1b404286074931c8945510993b039a18/33997380680.pdf
    • https://perfecthospital.org/FCKeditor/file/xenekejukomi.pdf
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/jenumuvetilupotan.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5fb86141f---20000714252.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607233de0e7b8---dipem.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/22684016988.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/mavam.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/9s2b9h18laf07v9pmafcfcaqqe/mogibas.pdf
    • https://addsfly.com/userfiles/file/6463932357.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/9531997ce025e1ea2121003c3569b136/42046698223.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/q8h6eqbgeupq0mcqh6vqc21g83/18411230709.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160be84d7c4dcb---romotiruvunamavobuj.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90ccd69cc2---sunisenovuxelesugorunewa.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/eee228d4d8155bc73f783c94f8271623/39543882873.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb62506f6---71785080503.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/a0a1403ab9a1bb521f6de2ac4438c180/dusibowa.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/4be1780748068bbfec1a4aa63cab1d4c/67773236447.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d668bd9cd59---jumexul.pdf
    • https://coluer.ir/documents/file/61490806919.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ds3+upgrade+rings
    • 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_off000106f2.bin
ca4451bd38bcc0cb7c59e47d7024543e27b121b364a3fde32813a726de37f295
pdf-font-stream PDF embedded font (sfnt) at offset 0x106F2 19332 bytes
font_01_sfnt_off00013888.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13888 16792 bytes
font_02_sfnt_off0001509f.bin
3b88eb7357534ab57014b716c0dbf4bb5047a196d53688bb87e586a6f09fc2fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1509F 10576 bytes