Malicious PDF — malware analysis report

Static analysis result for SHA-256 37acb755537f5ab1…

MALICIOUS

PDF

91.0 KB Created: 2021-09-12 14:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f341fdbfafd35f39169e213f6888e98 SHA-1: c693662794da9fb716212df4e81e3050f067615a SHA-256: 37acb755537f5ab196192e1b610636c5bf2fa51d4b59d35f9217c3b8396d9461
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to compromised websites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and link farms pointing to potentially malicious content indicates an attempt to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://coretry.ru/uplcv?utm_term=ppsspp+games+2020+download PDF link annotation
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/34947446484.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/93dkg47qj3lii27f6o52kulciq/29158477382.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/xolif.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109061400224166.pdfIn PDF document text
    • http://bubb.cn/up_file/file/19449393298.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131f59bc031c---megujolopaxuduxuvubepobuk.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/sumijurivejaromez.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131d9f61a849---mitosejafawalebodurelini.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///fulosodulubaropinipaw.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/zuloraxexolotuwi.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/45486741776.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e83991e34---46317395987.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/roloroxut.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/tonozo.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/32390123256.pdfIn PDF document text
    • https://nomortiga.com/contents/files/34681539028.pdfIn PDF document text
    • http://artio.pl/files/files/23839271193.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7fd61d1ef---82987667772.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/vivibojaw.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76062574854.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/3020286476.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/jukumesakopebaxezire.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/jewerevorixupe.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/62096978344.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/wulozububalosoki.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613566abca07e---sakepipi.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_off0000fe4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 18220 bytes
SHA-256: 1a97447b9bca6425bbdf2c932288c914061096b8fc584c9a41b29216ff082525
font_01_sfnt_off00012d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0C 10776 bytes
SHA-256: d5bfec6b5d368c4646f0fd4ba21be4666d024700c9bf54adef1042a334663bc6
font_02_sfnt_off000145c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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