Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53574c2f53d1c5f…

MALICIOUS

PDF

72.6 KB Created: 2021-05-09 21:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cefb63489d81a3d1be3224dd96ffe132 SHA-1: f85fe43b683078b67464c4b8de88d96712b21f94 SHA-256: a53574c2f53d1c5f2e7639904d84787ea3a5075ac604d657dde1422c7be75c27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to PDF creation and device information, suggesting a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833a033a672.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb270ef588---33467005016.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078dac471dfb---92086241284.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160798876efe43---50688033472.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/af9539943481b48044baae70e0d666da/lotoditelogiluditoxu.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8cf667919---kijunenaju.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bbda030cc---romamaleb.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/ca5fc9dfa0508f204c28336d570e715a/73904642541.pdf
    • http://arohitourandtravels.com/userfiles/file/memipogafasibetisirigike.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/25f4e0788102fea2c64f73b4b1837ab7/49558204319.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607902d9edebb---48879299814.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d7bdd736---5082266575.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607748591ff60---66580692904.pdf
    • http://phantasos.org/userfiles/file/wadekep.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/5kfiiadf5ng5cgafpjqmi21t2e/tolukomawegiduniwuwetab.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076616694734---luzarawe.pdf
    • http://asbufestival.com/uploads/FCK_files/file/65125616664.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mate+20+lite+android+10
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d821.bin
3626e282cea7754ab6fa70253f137bea0c615a911fb19086ecf5a7e2d29b3794		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD821 4760 bytes
font_01_sfnt_off0000e852.bin
f551bb215e29de6708ca3e5be96bfd4d6c28dc8214af1cc72145512281bdb415		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE852 11872 bytes
font_02_sfnt_off00010d69.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D69 4324 bytes

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