Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74a3590a0683c8d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 09:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 49b49e5e51cbdab7e3957895531c9d9f SHA-1: a75c7e301915190b85d8042f49878e2cdb3902aa SHA-256: c74a3590a0683c8d1e9c98dbaf54b82e18b217e3e965c04b013739182164e5b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 https://pistant.ru/uplcv?utm_term=raj+holkar+medieval+history+notes+pdf PDF link annotation
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/futigilemoxipuzarikajepug.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/imavs5tkuh5s4irv1bkasooelm/15956143439.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/zenutevepenefitagukapa.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/56594669222.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/71941995278.pdfIn PDF document text
    • http://dsraxys.com/uploads/33414325193.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/83247443.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ace3564f30b---wufumometugetep.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/o3q33l3djm0k2n83q0tesnrd4s/92634092284.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/07fafaaa0a709682e32ca3cb17ccb4dc/jigupu.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/murirorage.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/2896133608.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/b9390085e14864d07b09b8f95cd94030/75842965600.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/12310087543.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/33999191210.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/42766556917.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/rubokiwonewajedadalunu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160f9eaa834b5f---62255239744.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/81549085026.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5bb28f462---lafavikobapogo.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/wuzemozarejede.pdfIn PDF document text
    • https://activepymes.com/pub/file/67417538580.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/dizuvolewetufatatari.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e417250b1---42167382987.pdfIn PDF document text
    • http://fourfoods.com/images/files/jisogetudujizopefu.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA3 11208 bytes
SHA-256: fb40e483b17162bc1d6a19ffa28c7429885e3df94c556fa635b88bcf84d636c6
font_01_sfnt_off0000d8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B3 16236 bytes
SHA-256: d31dc96a7107996bc3cb07ff18c19ee30afeb02a4344526f6436ee06464bcd42
font_02_sfnt_off0000ee73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 20948 bytes
SHA-256: 1a3452f66506757b7cbabdf712fdf7e241b747e4ae7c94d7da14c7d14c653e08

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