Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b65c4d7ff52586c…

MALICIOUS

PDF

131.5 KB Created: 2021-07-02 16:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4b561cbc68d694407fa6fe977766ea08 SHA-1: bc072eabf314042b4029a6eacbb25a954ee62703 SHA-256: 8b65c4d7ff52586c8f4472a08466ef1946ddc24f9cb176ef896988cdc92b7c9e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. The document's structure and URL patterns suggest it is intended to lure users to malicious sites, potentially for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://wastran.ru/uplcv?utm_term=filipino+names+that+start+with+j PDF link annotation
    • https://fanaf.comarticle_ressources/file/41311938886.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/20775174954.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/pigelotezamupevidego.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/d3782de6d9583fecc537141e65b66d1a/buroz.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0261cc398---geromumuzirokuwo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8beb3e3bd---delesegabopufevoxezuxiw.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/50c2f67692fa3d5125376e7d765262b9/64294977365.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/53112625239.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d551e4ef03---29682001899.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/kifufixufuse.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/b494872f212a7ad77cf652310f680740/rumonijimejuw.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/pebakewa.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/cd9b426e7383b5738bda2a1dec85f502/4578173158.pdfIn PDF document text
    • https://europartner2.pl/uploads/vagodeletegakevutogewe.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/bizeto.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/24ff2dcc6a55546b678ed8eb99e32e90/46468727765.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/ab0a80d25162ab4f13d8be46f1d2b365/wosewixibake.pdfIn PDF document text
    • https://superpart.com/files/62737857065.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001c05a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C05A 21588 bytes
SHA-256: 97e92ed5108e7202bfbac2f69ae9d16d970b5fbaade29c153d9f73d3602249c4
font_00_sfnt_off0001386c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386C 33840 bytes
SHA-256: 7d8e8d8e2465e819bebde9749ba32cc566c025fc06a1ff363b4df9de3865535a
font_01_sfnt_off00018c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C90 8672 bytes
SHA-256: 48b6e2ce8180cc168fc1f72393d897542ee84fa57790cef22eef4de8f4df5fc1
font_02_sfnt_off0001a849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001e79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E79D 10708 bytes
SHA-256: f0047600cbdc8d32914cbe31796270800c2db969f136b550e800007eb798be93

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