Malicious PDF — malware analysis report

Static analysis result for SHA-256 7836aab478aa0548…

MALICIOUS

PDF

90.8 KB Created: 2021-08-12 13:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 4ae063dca1c125d02fe24e722d7154ce SHA-1: d5a81cf0ea9d6abc07a1bc5c1c2f71f0115db334 SHA-256: 7836aab478aa0548df5c3452f7eba70130d31a802c4b220e3df5a5efaa5b796c
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=toolbox+for+minecraft+pocket+edition+ios PDF link annotation
    • http://alibabashipping.com/userfiles/file/tiponumemisi.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/42184531291.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/36491832464.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/jawagidazawojage.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/579a0b5506ae34ed76c15dd1767f6e67/dimog.pdfIn PDF document text
    • http://hondaotohaiphong.vn/upload/files/98869712927.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/86397328500.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/54774394521.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/58511658112.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113020ba720f---52457684299.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/98158282182.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/38049538169.pdfIn PDF document text
    • https://keongracun.org/contents//files/57160863999.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/967e526a2f202f8b98f6928564de9003/25914138534.pdfIn PDF document text
    • http://petersonhigh.com/clients/33446/File/molafupob.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080a1eeb2107---kixadezaleje.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/86jak32sbcpdei261h2i5n1fln/23983251786.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/24520119828.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/tupolodefol.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4e625ec3c---73647025984.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/44695629065.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acca1d218e7---vizububerubif.pdfIn PDF document text
    • 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_off0000e0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B1 18792 bytes
SHA-256: 8f7ed438352dbfd270b6f9f8ef66c1219920058ced5d7011cd31f56b9fabb710
font_01_sfnt_off0000fd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD82 11080 bytes
SHA-256: fe2e318b7885097496644f62b880ccde0f4379ffdcde17cf1fcfa951a1660e48
font_02_sfnt_off0001171d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171D 17764 bytes
SHA-256: b7f585d095235cbcd19799690d14183d041da8571694dee0e5cc7fa3a46d01d1
font_03_sfnt_off0001455a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1455A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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