Malicious PDF — malware analysis report

Static analysis result for SHA-256 234133c6712d746f…

MALICIOUS

PDF

106.0 KB Created: 2021-08-17 09:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b7cffed7af4f1ecc945b826bb5e0919e SHA-1: b0e46b7dd90b5e9b03030c32d355377ff6601194 SHA-256: 234133c6712d746f005a191d406dad6e198acc41924c6818216f728e718f0bbf
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites, likely for SEO manipulation or to host further malicious content. The PDF structure itself does not contain readable content, but the embedded URLs and heuristic firings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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 http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989b4d3468f---wokelutejakogeletosixo.pdf In PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/cff48c16c6e1db6255056acb90115b6e/846547457.pdfIn PDF document text
    • https://icbacademy.com/upload/files/duroginujuburuvelur.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0f0d0e1bf4f77ec2ae0b3e3ea80264bb/70339407458.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/3371983182.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/69376831094.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6l8b6loor6s4gln9incokd2p7s/21695907177.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/2616754b1f808f10dcd6b5213838316c/wujiradebut.pdfIn PDF document text
    • http://sivam.pl/files/file/mefawevefuwawoj.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d36620ced---91811389371.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/38b815cd52f09e6aa764138c0222ba8f/42021806078.pdfIn PDF document text
    • http://oklogistic.lv/upload/file/61567333391.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16113a48e18315---tazekogojipipipavabon.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/f77a5b6df2708a8dea0ade519315860e/fagutowogi.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210807123522.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/jopazik.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/budilesapegamiwe.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/86db2d88fda069d9c66f26275a9ab47b/xowadapopilopube.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/mifedexaxanikuna.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/sixakekowo.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/0fb9077efcda45690e4d41814470e96a/61158154467.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa88848c0a---dexaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=exo+travel+the+world+season+2+sub+espa%C3%B1ol+ep+10PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00016eed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16EED 22580 bytes
SHA-256: 9917b37debf9cccae0d74e207b1580a9d94408e9f1d021ebcd474c214874c8e2
font_00_sfnt_off0000f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8E 11372 bytes
SHA-256: be792e2d48f209ccf36172aab7be07c093ff931b534a64b225f994aaf3a0055c
font_02_sfnt_off000129f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F9 25128 bytes
SHA-256: b8b0dfbf09e1647944db6c1a2eee9d72b819daf91b6302e0c0bca4bf112fd4a9
font_03_sfnt_off000164b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164B9 2312 bytes
SHA-256: 70169a3fd21feee1e056700b42c50c708d754d8a4730e20176a89e3b67f064a5

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