Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1e22340c17be72…

MALICIOUS

PDF

92.8 KB Created: 2021-08-03 16:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bf11549860961376c1a48ae19ea8dcb8 SHA-1: 5a68c037b3960cd0842c7bb651ab1f9539d4f726 SHA-256: 0c1e22340c17be728cd312c301f6fe09ce2616e94e325401a0dc9858fc7814a7
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs. Several heuristics indicate the PDF is a link farm, with some links pointing to compromised CMS uploads. The presence of a 'download button' heuristic suggests a social engineering lure to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/lisuselorimomegavaresog.pdf In PDF document text
    • https://sealskinz.ru/files/file/37601504831.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/69097005828.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085151ec51be---24916999427.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610492adcae8c---zivevuwufupenefet.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/56633834249.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210730034459551.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/42882679135.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/cbcd34921ce27d4f3e3930cd95deaba8/25292272387.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/zexanilowenoref.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/24044369824.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc987be449d---62997718745.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/tflmiamcfgl2vmg8n6nj53hmo6/82470944288.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/48148038069.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/71166806225.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/2368706442.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d943578180---63638401409.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/df68328f959e29653a1de6afc741a0ef/36522640410.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8bcb2e0d---tojuzuxaw.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/llj7pe163tfdotufhjhdn6c3d7/55351653814.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/67458406432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=minions+movie+2010+download+in+hindi+480p+filmyzillaPDF 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_off00010519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10519 11464 bytes
SHA-256: b293e49ba386d8de266499bfabf8bfc52c09f7f5016782a38956043831dbf6fd
font_01_sfnt_off00012035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12035 17140 bytes
SHA-256: fe82b351170dbd741d8c7b85502ca17e77b369abe183a727d70aa7588255c551
font_02_sfnt_off00014d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1