Malicious PDF — malware analysis report

Static analysis result for SHA-256 537200971301bb23…

MALICIOUS

PDF

89.8 KB Created: 2021-08-19 06:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5975eda4c608f2172ef9a16f80988a7d SHA-1: cfa69d358987d5d719aa38864a839425406f8356 SHA-256: 537200971301bb2357e9e9697af2144ffad13d37af2cb95ef120f966449f9a2c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/322c74d1cfb141c3f9d671ea6debf776/33623315116.pdf In PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094595a9cc87---liboloj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f712358bca---23424922572.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee64c8cb17---15045724652.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/gonuzadepasexipoloxe.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/rikunamotugum.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/lekudapukoxitagezusuti.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/4tqp3rjeofkmdfs6rfv4av3151/telopavik.pdfIn PDF document text
    • http://skupka54.ru/upload/m/tilikomi.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/844b9a13c192f1827731c0a075b0dcfa/15702012285.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/77828630653.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8aa2c1843a---19020603498.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/23243678946.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b4a67f350---12957617200.pdfIn PDF document text
    • http://flexa.cz/docs/file/35385469115.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/degumemojefe.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608916cec14a5---fegojexewegajifelikod.pdfIn PDF document text
    • http://hydrem.ru/images/file/47752849247.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/miban.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/82042387675.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/waduve.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/0e4dd2c03175981cbb5fcd1cc6a2b2f1/66730930127.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b46e1dca3---19460436366.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/guwakesewetakoderumedip.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/43552290020.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/82003442561.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608b924c648a9---munopoxamujuvenumarede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ejercicios+de+lectura+musical+a+primera+vista+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 10956 bytes
SHA-256: f191fe7a4ada1af8af9f57105b8720e8d4349c1a9dc07609278ff1665212c4cf
font_02_sfnt_off000113ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AB 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_03_sfnt_off00012a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A80 17968 bytes
SHA-256: b744705811f04f954b984b1a3d5af17183de2400cce6b2eb157aba75c234cb17

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