Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f61f11b97d5106…

MALICIOUS

PDF

115.2 KB Created: 2021-07-09 08:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3f4d4d1aa829ed497b8cfa81b8a1a8a9 SHA-1: 7d04613147d529e85b74eff34161f88caeb2e42c SHA-256: 03f61f11b97d510623c53db1873ed8d67e42dac8f07f2d1620cd8820110f412c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9691

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://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/906a498fe6c1fe861e09958368ff8b2c/woxufo.pdf In PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d2c77a099---88525218712.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/761ijkvdj8qela3ukmua73b5n3/5699292278.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074700562864---83577680571.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071f1e366d5f---53309252004.pdfIn PDF document text
    • https://majubesar.net/contents//files/fuwasokezafibadabazas.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/2svo8rp3nfjs9toper58g0p7l0/xamuwa.pdfIn PDF document text
    • https://spacio.hk/attachment/file/zinaguwomokiposubisugobab.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5538321f24---wovododajik.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3f848c97611b90e430654d698b338a72/sopinaxupul.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/danisesebima.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/rafibekemojorodavus.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/77ded6082ef981f382236b3c2992b91c/50642217763.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/9791112711.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20592e334---jugisedogiwulaguvovotite.pdfIn PDF document text
    • http://jaatkinson.com/userimages/ginuraze.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/f7bd6e9112d4a7496a485660696c7231/muzewovetiz.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/daditogawaz.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/koregerimu.pdfIn PDF document text
    • http://gpn1971.org/clients/a/a2/a25689677492d603657f1241a2a69ea8/File/79544437553.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/46a611fb77db9e8ddba7d533cda82ef9/67478721374.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/ferabiwoxirisit.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f514d028e5---kagumuloveg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=classification+of+compound+wordsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001a56f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A56F 17036 bytes
SHA-256: ad820cca85b2a79eb9b15824ae8b9508ead5f1df08db413106b141223f8a0c27
font_00_sfnt_off00012520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12520 3216 bytes
SHA-256: 6443bc3bb4fe696876a5c0a8f97d61f869907147f7afcbc5c3277a59c7745bae
font_01_sfnt_off000131ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EE 28244 bytes
SHA-256: a3679f0edff3a6c922c125188fc94109292be8e458ad142c3dd6f31ba7a99240
font_02_sfnt_off00017438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C4F 10868 bytes
SHA-256: 5d73916fa6d88ccdf82adbdd6fe4eb2d2bfd40afa6540ffdd7ce80d17969c661

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