Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd79bcf6553fdf5…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 15:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a57b51f5572a94b6a3545e97e123d54a SHA-1: 3ee146830f04af1d8690d1aa8f36d338112f0b65 SHA-256: 1fd79bcf6553fdf520267820e9cc172adf627422873d86cd7746a91f3a03f52a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external content, consistent with phishing or malware distribution tactics. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=manualidades+con+carton+de+huevo+para+ni%C3%B1os PDF link annotation
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/88812245929.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/moreranawasamuregedak.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/i90jp8980vttdle47c1jrv95pr/76627189076.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/pkcf7a9kdqrltkiq4ifv0jlabe/18385050171.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a997bf2e0---nuwow.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/80773088639.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e9e24ae6---73091958684.pdfIn PDF document text
    • https://atl-50.com/files/file/65022939157.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/lalupuxinonewarudabupe.pdfIn PDF document text
    • https://grandegroup.net/files/zonabinikomiraxasekak.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/folelupizukisos.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a035f524635---1108109255.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/3ce66c218486c3793e32f52ec44bdd60/81116462746.pdfIn PDF document text
    • http://cutskytools.com/d/files/vajapusemuzijikifawil.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/tuzajakujibuv.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612759c17644c---rafovow.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/banegavaxetanekevadad.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/jisuzuzowuboriwibexus.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4f55a674119c94122954d5d5bdf82ac9/napupalexegevuk.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f5deccce2a3aac83e03b0ec656d68339/53374188931.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdd98d005a---levifavusopebisit.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1253d2d4f3c66da9360a59104aad9962/bisotijopu.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210806/16281866448980.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_off0000d638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD638 18644 bytes
SHA-256: 1c5cc9ef09d6a9537081309c1e8ab1d811f1c543efc7f3ac0683e53a3be4c3fd
font_01_sfnt_off000105d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE8 10976 bytes
SHA-256: b2232bff18716011cc194038b0161f851a16902a043b67dcc225a7f52e2c288c

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