Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce04a9e6a52fa977…

MALICIOUS

PDF

78.4 KB Created: 2021-09-09 22:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d4b8d7247eb0d28221885c08da1374b4 SHA-1: 3c0fa6d89ece79e9dc2d95ffe79522e7d3f39d44 SHA-256: ce04a9e6a52fa977232a78472a3e08cda789d3940c34b64779c7a94751343855
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of embedded URLs and the nature of the heuristic firings strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crewmak.ru/uplcv?utm_term=screen+share+mode+on+android PDF link annotation
    • http://www.tobywells.org/media/fckdir/file/sijetafu.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109051536253264.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/70402786080.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/64645569202.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/xizomozotoraxex.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/24922725891.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/0a85ead5214078d32b0a0e5f61ace1ab/tusulenesonedonek.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134234bd0711---98557459841.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/tatasujejejuwesin.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/37076206311.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/28813131905.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/32761003951.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/retasadebinigezinovozi.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/57084616925.pdfIn PDF document text
    • https://bawauang.com/contents/files/tekakunu.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136d4d247f61---72570439627.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/79366945192.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/38038011954.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sesuti.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/vokigotimumisujanilasexap.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16139d4b73268f---76071695583.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/24259436386.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_off0000cf10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF10 17756 bytes
SHA-256: bfbb8a1d44c956151601a532a4b065e0654ef11b6eb3a4bd2bd197f74aaa1357
font_01_sfnt_off0000fc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001147e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147E 10568 bytes
SHA-256: 04dfa0271fd82dbfefdc9d904fa2539f639e10a4538fefc5d392788898397a9e

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