Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fa82f496233250…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 18:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12c0033137b1a091e9a4f876c1a8042d SHA-1: 244d51ae9bdbf2a89bf1deec85704bc816e319f6 SHA-256: a3fa82f49623325083b176e7b8708025fe43be07070578558723ba278f5362d8
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised. This suggests a multi-stage attack where the initial PDF serves to direct users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hirurgija.me/files/48753898407.pdf In PDF document text
    • http://reicar.dk/userfiles/file/39959682016.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/28758118987.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba48de04ca---pifenusinuragiwabawe.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6762445fdb844122af041684f56e5718/97093806457.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/68150488474.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/mefisemikedepipufo.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/47839321987.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b28ebbd3738---tejesuvaxumewugufewek.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/14/file/82706158194.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606dff45d442d---36249347549.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77944569113.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/db2bf1840aa7cbb08fe354714a1e55ef/7289967372.pdfIn PDF document text
    • https://telorgabus.com/contents//files/lexivovenab.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/rfn1cts9itv828dfltkor4rm1p/53479145520.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/vemupukakemimivofavumis.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/87147281780.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/cidlnq91fc08rmb8t1o8jeg4bo/futip.pdfIn PDF document text
    • http://prosquash.by/data/konuwoxatowikuduxa.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c88fc0c9236cc596937b3aee0bb9b654/zezikedenuvobolufejobi.pdfIn PDF document text
    • https://tjpapigroup3.com/contents//files/wexavemomabeje.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a83ba9e6547---farixoga.pdfIn PDF document text
    • http://snft.ro/media/file/xujeranibube.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/sajufewolaxosan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bengali+letter+writing+format+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 16336 bytes
SHA-256: 3a7af5d927955d58e20e0d5c0299aab4f96aeab91689a8172410776ffe8621ff
font_01_sfnt_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 10812 bytes
SHA-256: b4b9bb96e3dd2ef3a2f8ef8ca40dcc4f981f74ec56f12025128714eb86a97966
font_02_sfnt_off00011bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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