Malicious PDF — malware analysis report

Static analysis result for SHA-256 c196fd18c7dec787…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 12:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb3653eb7067903098d45de2c8a4c6b4 SHA-1: 15c8b596a30780905f35f307eaf0b8e38a8186e7 SHA-256: c196fd18c7dec7879af295896d98a76c210d82dd3213120502d5b5505054a267
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. The heuristic PDF_IMAGE_LURE indicates a typical phishing shape. Multiple URLs are present, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://smidgel.ru/uplcv?utm_term=transfer+purchases+from+iphone+to+mac+catalina PDF link annotation
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/damifisokodatudokusuku.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/10112903840.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/46556710310.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/boxivorimasu.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/35979216000.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/gemetemaramuvasekidisam.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/vixizenajusil.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/52ab55bd453830d570ade51ff8ec545a/3242411536.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/zoregomitenopiwazakewiga.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210902134346135321044.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/zidiramorerokaxes.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/dijebuvifumugaxotizus.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/toxadopizitafegixej.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/84032049529.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/vovitamilaw.pdfIn PDF document text
    • http://elpijisystem.com/file/56828663192.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/67152823955.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/47130539823.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/7745ecba5a12b8c95b7a6642860ce083/jojoma.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/02937c2dee7f3c36473893ea122bc607/23700379439.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/bimebofu.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/xuzewajegemuto.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC826 10808 bytes
SHA-256: e4c5bff24b844ee35d570212bf28690b92cff9c249d56ccef6a9f226c38ba322
font_02_sfnt_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 14444 bytes
SHA-256: 49216d946cf9266b22c239028a4aabd20edbefb2a45a198d4c4900f2dbb05069

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