Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb7da21fdf71837…

MALICIOUS

PDF

79.3 KB Created: 2021-09-03 23:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5231e4b9868174799ce7ab4d3b1f46cc SHA-1: dc87c2976cf53f9917a459857749e30fa7dacd0f SHA-256: fbb7da21fdf71837681f96ad1764e1d5dd4a3d74c7f15ec17105eae88512cffb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine rankings or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074bbbeec349---lunoboxa.pdf In PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b091a44f9a2---vedafisusewinute.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/2698276888.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/jogokotosofulopigo.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/55516364120.pdfIn PDF document text
    • http://hongquangled.com/upload/files/jezoladerezi.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/72409006068.pdfIn PDF document text
    • https://lepjunk12.hu/uploads/files/88963344334.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/25156235105.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/tavawixiziwulidufakewibo.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/48601735729.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2370c9470---10884755230.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a68890dd2ea---pijekopuvobi.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9b43b650---1837984063.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/20704659582.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/lugogomubadupipotezitosoz.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/5mvi9bshbjl875eecg1rco2u18/71138432546.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/milazefapesefegekozep.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e26b4dcf5---wazimepufojituzexoriligi.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/43386710136.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/fci4fovcn1i2l37qb8st0m2660/lavexiwevogapoxe.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/49355318639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=quiubole+con+para+hombres+reloaded+pdfPDF 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_off0000c709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC709 11084 bytes
SHA-256: ab88430a22ffde37d4d741a1af93d4cc742abd56aa37182a1c3a93d4b794bc0a
font_01_sfnt_off0000e070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE070 20476 bytes
SHA-256: 68ba4785c449530bcbead88392420d90bfba3e6a9d7c2f675d947330e017d5b8
font_02_sfnt_off0001155b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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