Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af2ca69eef67a4b…

MALICIOUS

PDF

74.0 KB Created: 2021-09-05 15:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0f8d34239e8f1ce5356847b0c2deaed7 SHA-1: 746d9c10a35b0dbcc582455efc8a7bcfd75c9e69 SHA-256: 4af2ca69eef67a4b04f47c7a765f5ca627bc64c10d8d4738a1e2399081fc24a4
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous URLs pointing to external sites, including those hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bagiez.com/userfiles/file/vojaliwawizotuxov.pdf In PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7332787f07---sakutasojevo.pdfIn PDF document text
    • http://www.heksan.com.pl/file/serogogaxekabor.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ajr01e1gi1cbtd488rlmcuqvc4/jatopivotemizarukune.pdfIn PDF document text
    • https://0900107678.com/upload/file/zidazutojonajipimosawi.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/xupova.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/bevulazujo.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/tefasaduxuduw.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/0e5acf91ad7b211e3facf00c6cb9fc4e/19341219986.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/82492178372.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/gekoguzugawup.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6d643dd9baaf9485ea4b3922cdc88d0b/1774977783.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/kotugufonelamirobarote.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/67108015957.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb63584dab---fikukeb.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/c63d142d67fbf6a1d0b00d2e2d77c540/verenujanugo.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b0bc93edd9---vofowimajawakivuwaf.pdfIn PDF document text
    • http://zimmerei-possert.at/pitobijosekutadolebijoba.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/sobedixibo.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/lofujifi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d8f39c8db---newurabesapinoxukosoreze.pdfIn PDF document text
    • https://southafricapools.com/contents//files/81718600457.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/9a088rbunmgth6j1l5qi0cnma5/metigizu.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a12b9243a---76366581433.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/89923258882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=corel+draw+tutorials+in+tamil+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_off0000be41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE41 16620 bytes
SHA-256: 79ead1b360fd7003a4e86df91d5c16cad5479a62c89751d460332b2ff5c7bc0e
font_01_sfnt_off0000e8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 10876 bytes
SHA-256: 63eb423d3f90f6ed5a4d1bf95edd627c8bacca8fd294b74c66580fe285fed056
font_02_sfnt_off000101fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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