Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1561dac50016880…

MALICIOUS

PDF

91.5 KB Created: 2021-06-28 22:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0924f70b6b79113875dbdd530b63b515 SHA-1: 0aae2e214899567d71ba1ab54fa0b6fc37f6d682 SHA-256: b1561dac500168803514d300e83784e4f60b80b5f72f181c9e6cb65cdfdc624f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classification and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to various compromised websites and potentially disposable hosting, which is a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://philabc.ru/uplcv?utm_term=roseola+is+caused+by
    • http://www.cddfct.com/up_files/file/85330552492.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/wixewiduxavinemazovebatis.pdf
    • https://brod-plovdiv.com/images/71709189805.pdf
    • http://shosholoza.de/file/detomegazopozukozuko.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bab030e2e---10792624803.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/180658aa0781e0f335eade869b210007/16318360490.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/bf9325b0d2b05cb83f22e808cb20283c/52832552098.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/ed18c0bdced3bae07a1913bef98597e3/14646976806.pdf
    • https://inifd.london/uploads/file/19839033165.pdf
    • https://gretajensen.com/ckfinder/userfiles/files/fitusolafur.pdf
    • http://pincailight.com/zk/UploadFile/file/2021061522450573499.pdf
    • http://adance0112.com/upfile/editor/file/32498918135.pdf
    • http://aps-mes.com/files/file/gumopeludenebuw.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983019c79d1---68315507521.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/8602453369.pdf
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/ec141bd8e2e83244307472aeefb62e9f/vaveluxokuxolavobozupemis.pdf
    • https://mabuksusu.com/contents//files/sinasigexulovoxogebi.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/g48o9cnle0tv809klg1bl8ccnf/83764079945.pdf
    • http://winkeleninzundert.nl/uploadimages/files/62594224527.pdf
    • http://www.biotanika.pl/upload/file/28562293585.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/bsefg1djecor7vbvbh0vqmeiu8/wovizobijuna.pdf
    • https://mldom.xyz/web/img/podborky/files/23257920131.pdf
    • https://apotekatia.ba/fajlovi/nemawabeja.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/jaqfhsnrs6rnlc43b6cha6pglb/vepinetire.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaba.bin
89f1836932b003b7df28af9e5aff8ca14ea6b34fb1e669e0d0888ef440fec031
pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 10460 bytes
font_01_sfnt_off00010294.bin
98bcec2be85b547d266a48c61dccc50816b624367bf69e2f194f2b8087d010f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10294 16092 bytes
font_02_sfnt_off000117d1.bin
7cc2a3669fdcfb4b69c140d2e7e42d636c439809cff1f88ddb446e59890f1c89
pdf-font-stream PDF embedded font (sfnt) at offset 0x117D1 17828 bytes
font_03_sfnt_off000146c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x146C2 16792 bytes