Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c1c9066447e79c…

MALICIOUS

PDF

89.0 KB Created: 2021-08-04 14:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d70c4cbb65d9e2d7a3a567f9ea0b32f0 SHA-1: d4076c47e25a07e78e37fa07f21eca4d1452a874 SHA-256: 87c1c9066447e79c5650b5eaf2093b3f2bf3c0c2369de2a6abe6f8dc27ec1eac
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised or disposable domains, indicating a likely phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be non-readable content, further supporting its role as a malicious container.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://food-cloud.com/home/food-cloud/www/site//site/data/files/gujuxepom.pdf In PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2rccq88u6j6hhjp1pjlj3a9jo4/66010385999.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c3fc7e55---60837100062.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/d57095a691e5f7d0cedefbb65c558d85/sejoxakamirit.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202171823368971.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/xokepev.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/75365224657.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/widezirisuzilibuzezes.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4e41aea5a14da6c4049fa869ec65e6f8/zadoronisuxorisa.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/wotafurexarifivuvidan.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076965994768---89359192580.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/19745727585.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/012cd3d70b847bbc6ed4b283513f4843/sixiribawapusexonatod.pdfIn PDF document text
    • https://bdata.vn/upload/files/debogetadinu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ede3d34db5b---labufujeni.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/acf72a0bdc589dcd857ab5346e4df969/79826692423.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607948f9ed4f8---mibamevivuka.pdfIn PDF document text
    • http://apvn.info/userfiles/file/38664235402.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/fagutajufi.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/farizutitupodovubeduxe.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f707a5ea9e---84216369250.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/mubenexefudevawe.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/dc45ac2298582f5d8eb4c7ad188d7ca2/jevaxali.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4082d80318---wojadekegeziradez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=solving+mathematical+problems+a+personal+perspective+terence+tao+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 17272 bytes
SHA-256: 2363990910f2ab89481d39b36d3724ff84c888fc597d4529f67fc112cf9e1565
font_01_sfnt_off00012342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B59 11348 bytes
SHA-256: 06e019a9c412ec067cddedb9adffa4e407c544f7faf9e7fa352b41aee9ba435a