Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c240d8b60f9cb8…

MALICIOUS

PDF

123.6 KB Created: 2021-07-08 16:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 007efdd1e7d82ef2276b9f0ba949033f SHA-1: e5fad84db241bdc02f523ddcf0fbdf285ade4a8a SHA-256: 84c240d8b60f9cb8d33230fb2b0927b1ba2e55e2c0b96a20f8153bb914d0292d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous links pointing to potentially compromised WordPress uploads. The embedded URLs, while some are marked benign, are part of a larger pattern of redirecting users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/32254c542b9b37baba7dce5c67967b36/tanademugatubodakad.pdf In PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/wujevitubatu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acbe3246091---gevalizeveb.pdfIn PDF document text
    • https://506hlapeta.com/files/file/botesojewalu.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827bb6eaafc---zovukofimuvogekegodezogo.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/5h4gnedr1rqbcm08957rvjgltu/lumozosuxuvifipufivera.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4b048d84b0a46ab4111da82b4f3f40fd/zidenos.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/40866067860.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/petenevesoladituzexosifiw.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/90745750604.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/8dj1655reivi5hjc2lt6j8mki8/54373734572.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c58c10a5b---mupiri.pdfIn PDF document text
    • http://gtshotel.it/images/file/79468669809.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/ligimajafejelatur.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/rigizebunonaxa.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c0ab618879296fa0d15a38dd1246ff11/mokafub.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/ruvuzufe.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/44594262247.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609e10df817a0---xawizewewotejax.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/72b3f4e73328837dee3743642516cd90/vikina.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acafe0c2dce---57848435530.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/545ac69edef0106a9450374ef0537355/duwanisuxaxemadevako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=factions+in+governmentPDF link annotation
    • 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
stream_002_off00016111.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16111 19416 bytes
SHA-256: 9c456ee8e5a63c6d63f489c1d34e9e41dbeb9aed00d86fd8a097b942e47bffb6
font_01_sfnt_off00018179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18179 18308 bytes
SHA-256: 2d4bc5bf27d024ea9e4ea574939d4d1c3956742c7c1a700d327ef60b62da6fed
font_02_sfnt_off0001b098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B098 10568 bytes
SHA-256: cfa3526cb483d3579c55f5675779b0e44f5272edda8f8285d333cb07dd9e7752
font_03_sfnt_off0001c8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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