Malicious PDF — malware analysis report

Static analysis result for SHA-256 7057cdfa409e14fd…

MALICIOUS

PDF

98.6 KB Created: 2021-07-04 06:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b63ac152c1d5c321d5a7b75aa4513d3e SHA-1: 39f29d91fb02056046fc028eac73b6911e596a3f SHA-256: 7057cdfa409e14fd21cfb2bbe87f4885080851c9cca5a304399f03ee4539b8b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the presence of numerous external links suggests a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://rltclassof1970.com/clients/8/8f/8ff9f19c840b982a6efda18ba8bb483c/File/90313536924.pdf
    • https://prtl.pl/userfiles/file/laperetizif.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/71e33de7df20bfbfd6ce0c185528ad5f/41355373495.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070ad1aed5fa---limurakijexo.pdf
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sejebikutidunulob.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/4e2db78f15bfb0d4b1b871e9f032faa5/juwojubidi.pdf
    • http://mobilesamara.com/img/files/file/73585748575.pdf
    • https://feltshoe.com/userfiles/file/rapogifosumez.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfb53cebee---wuxibijijuwedafan.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/50pqpbff83qsklfm0dgrga1u33/delorim.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160780edc7e284---78280196429.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/ij8oh1dcjdnfuv2gl614kso792/84567768273.pdf
    • http://kbchina.de/upload/99594340347.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/4aa4a4a03ec716301b58c6bad745e79c/7515072623.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/907725ad3dcba21f333b8afa0c594de0/pemasel.pdf
    • http://akicgiyim.com/userfiles/file/gufaluvig.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47e9c6e093---koxesilev.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e3f7e9b36---827501041.pdf
    • https://soudurelauziere.com/upload/editor/file/vupaxovakelasesubo.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160785d24e3d0c---ratitiduzasivotoza.pdf
    • https://jpjplumbingandheating.com/FCKeditor/file/xixibiwuw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=experience+certificate+for+civil+site+engineer
    • 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_off00011355.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 16792 bytes
font_01_sfnt_off00012b6c.bin
275461a8578c15e18d989fda6aae40509d41628a9bc660afc5e681380fe56f62
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6C 10808 bytes
font_02_sfnt_off00014482.bin
ca4edb34b3992f9d5a981a11fcc24fe475813e2403f172c86a1cbc2db9c1ab5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14482 21232 bytes