Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f78a85b59b9e18…

MALICIOUS

PDF

81.4 KB Created: 2021-10-15 17:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f6bb7504b709b4fad246737f848f291 SHA-1: 09d76bf3532972cd6b2f7e82ffa4e44e34ac74df SHA-256: 34f78a85b59b9e18ff656432da680107925046bf78958a243454e85254ea26cc
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=how+to+please+a+dominant+woman PDF link annotation
    • https://cliniquemyo.com/userfiles/file/82432696342.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/2edadfa1eef69a123b76c341ba9a554d/18756719124.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021100511575173499.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/fanowawujilu.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/pelisobiwinumamoludu.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9ac7cca49---jedisiguzenudav.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614764c285a74---mivele.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/dukikelijobezarulanegapiv.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/18178523755.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/zazitadumuwumag.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/rivaremubuvefaverananobu.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/44929922503.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/lovore.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///70671240543.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/tijademibeliwas.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/c49ggd7cklt6cce9na749a3od0/rugodimilupapewozixen.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/jipezizebubofevoguvino.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/fezaw.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/11790647987.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/98886823264.pdfIn PDF document text
    • http://nissan.e-library.tw/uploads/files/26499680389.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/fcbcb50b1c38309597ce07f8324da222/felub.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/lupideza.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/5030135772.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/v9uq41f02gfdalbjhdbnr04bfj/pugekolexi.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/pulivejufozozopudaxoxif.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 10528 bytes
SHA-256: 763f3217381a5f6d4e5e0bcb8286af7ad6b49921438c9b700da1ea1d1647bc00
font_01_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 18228 bytes
SHA-256: 665c37ce8cbd02b0e501afc437d0fac9f8557890617c11619e7a6b5302421404
font_02_sfnt_off00011fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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