Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49dfd014e0a649e…

MALICIOUS

PDF

93.3 KB Created: 2021-08-01 22:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31ff4b7c3cfe693164f8e001157dfab1 SHA-1: f97f58166b5c94a08adfb803bc0d91af523c49a8 SHA-256: c49dfd014e0a649e6c74bc7c5df2795b3043972bf66051cb834922e6e2159faa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to numerous URLs, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://tv-kitchen.ru/files/files/40485812921.pdf
    • http://ngocvietbungalow.com/upload/files/mobilotabesunibolo.pdf
    • https://olterus.info/contents//files/30343870509.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9ehg1v0lm4qdhu6msb4n939f77/58458392694.pdf
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/22124630475.pdf
    • https://pasarantogelsatu.com/contents//files/masafijuzamivuzed.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47cc0d674f---18268503659.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/grmllbf71t897m670iqf0fu4br/rifizovikitepinodezixinop.pdf
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/wujur.pdf
    • https://floraplant.gr/FCKeditor/userimages/file/faturakelop.pdf
    • http://tikatalog.sk/_files/file/55815368747.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/50955e81da82a4a7c46b3604f6b2df38/72534978401.pdf
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/58867470824.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/268ce2d0471e81e27c8c6564ed617914/78275352186.pdf
    • https://araprinter.com/ckfinder/userfiles/files/sulibesesobob.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7822dfac5---14070388023.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fafad0dd15---12965128951.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/1a56e2862cf568b9b2fe16e7d0f78f32/tisusajowodafabapofoxapul.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/e270984c6a6780f768e89a9a3d4ec742/76403182723.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c592faf1e66---24700370481.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609113e7a858c---67178475419.pdf
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/47751282933.pdf
    • https://horticulturenepal.org/userfiles/file/3438215989.pdf
    • http://podiummoda.ru/userfiles/file/24038664399.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/4tlf0bl0e8tajp3cm6h8e93lv9/89548158614.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=google+docs+voice+typing+mac
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001063d.bin
49bea0b83303c8cb64cf2631033e0ea3dc8d104b76b903170b606f3e41d56c95
pdf-font-stream PDF embedded font (sfnt) at offset 0x1063D 10976 bytes
font_01_sfnt_off00011f8f.bin
93801b718ff8415bd7dc2ea10774a67137974f72baf7fff0a810238ef3a50751
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8F 17572 bytes
font_02_sfnt_off00014cd0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD0 16792 bytes