Malicious PDF — malware analysis report

Static analysis result for SHA-256 527d64c129cdfe39…

MALICIOUS

PDF

90.2 KB Created: 2021-07-17 11:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 56a691e029927014a4494e31e8dae095 SHA-1: f850da09cf1331993bd83cec73c9b927ac4e7503 SHA-256: 527d64c129cdfe399a39c0f9280ef5dc46f0264dbc649f889bc0d48f983b4db3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many embedded URLs pointing to compromised CMS upload directories and disposable hosting. These links are likely used to distribute phishing content or further malware payloads to unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://agnieszkapawlik.com/userfiles/file/varutanefadebuv.pdf In PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/32c8b5fb6c16afacc25240f873a918dc/80871356731.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/49461586019.pdfIn PDF document text
    • http://fabtur.ru/upload/files/49407669295.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6fc27140---70242606011.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/092135029135.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/zasegizewonumazetibumux.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/57669500836.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/f0936e54a03c3638cf71755509b72f10/suwana.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6456a87e8c---vaxek.pdfIn PDF document text
    • https://sca-kc.com/scauserfiles/files/53234213943.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608688758c2d7---30542164964.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607994c168613---45380947422.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/92ff21e550f0e9f7d317083339030e66/xifenimibiziloman.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/46439294902.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/jasavijutuvagomire.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/98609489175.pdfIn PDF document text
    • https://t2sc.me/userfiles/sejoxekowanokolebewowe.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/4ab93a5464db97ecaeb832492b6c6681/23531590612.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/36323653517.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/63483061368.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609654fb122f2---relijokapuzexibodej.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/57237645371.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/39469783805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=comparative+constitutional+law+by+hamid+khanPDF 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
font_00_sfnt_off0000dd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 17540 bytes
SHA-256: a3ad2be5b26255a2dd38276a462e27d6def8dae5e2b65aeb0e3963c168d99529
font_01_sfnt_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 17672 bytes
SHA-256: f0e39b3902f42ae403a8577d1911bf287014d874b8ff19b7b91b6412dbe67675
font_02_sfnt_off0001261a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E31 11408 bytes
SHA-256: 55b71653711cfc4d0ad51c82fa1748a84a5326b73ae09052bc45f160284cfefe

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