Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e554b9eef0b664…

MALICIOUS

PDF

101.2 KB Created: 2021-06-29 01:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 12fbc9cf806fd8f8a8cd9129ab2bd0df SHA-1: b5922ceb9a9c27543f0a9bd958638f8023968dd1 SHA-256: 09e554b9eef0b664360d1383c9a744a1b5fa9fe9554a04bf83160ca052dd64e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to manipulate search engine results or direct users to malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The presence of multiple external URIs and compromised CMS upload links strongly suggests a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

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://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/c705456447cdf6ba4ac3650fa068678c/4753331083.pdf In PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/zewaxerisixipa.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075ace65003f---bisepanonup.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/fdbfdae0e6aea7845ea40e551b7e14c4/70025762905.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8df06832ea---juwoberorunizifozovo.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc0d3b0d9e---77139025903.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c28878b381---7025590789.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/20752972308.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/16409730213.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/f99ef6459a639bd266f3dde3f26d0a8b/mivubidasuwubig.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/47977826959.pdfIn PDF document text
    • http://abnicum.com/files/file/suravunuditemulujezet.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/57674577153.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef9365fb87---82436840311.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/10936981480.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/lunopepado.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/hu9tf62c592oev9rakqdprbmiu/16455523431.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/wezaviwoxaj.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b5fabd149---raxomimapemojotabelalozil.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075ed2d060a2---65111136498.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/82700163695.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/h49fgetq3f5j2pgl1ihe38ev9a/gejuvonavabimevomusanonaj.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c79d18d0eb---wewivodilovadafa.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/ed6bc6a388af748983618245a98fe9f3/14577072537.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/mq0lje42o0peeegldv8jll1p51/53346633937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=rustling+leaves+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001138f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1138F 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_01_sfnt_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001312c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312C 24964 bytes
SHA-256: 57242bdfcfd33a2730933ddc33a6cefece2250edc5544792ed2a35d9623f50ef
font_04_sfnt_off00016ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EF7 10444 bytes
SHA-256: 9cfe2117658ed8b8aab1625bf4293db20bf7e59a6b8f0e2f38974bea8377bc37

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