Malicious PDF — malware analysis report

Static analysis result for SHA-256 553f0c85cb49b38b…

MALICIOUS

PDF

93.2 KB Created: 2021-09-05 02:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 14f1c20bcddb9a529355313de3e28369 SHA-1: 7d5335e191c738fa669e26c4835f6ac235d54543 SHA-256: 553f0c85cb49b38bad196e9b91125fff79741faa4b8621407aafbce1a77107eb
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating an attempt to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous URLs, many hosted on compromised CMS platforms, points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eb6d296ad---65528915414.pdf In PDF document text
    • http://photou.cc//ckfinder/userfiles/files/87911133492.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/cce35256859db424d9416438e27815da/63035531823.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2242d9c696cc2c42631d86c424bf1168/digudejokazaloga.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/5761227646.pdfIn PDF document text
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/jokigudixireniselovukivuf.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/nj6q0ee8o6stqu3kdmt74ojahr/zufijarosatatipato.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/30cdcdc512f4d3b8be4cf3a052d02d5a/67919400342.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/nibasupokolobopuguw.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d20294776---81424190698.pdfIn PDF document text
    • http://runhouchem.com/upload/files/30052616693.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a21b76e2ae---69171789484.pdfIn PDF document text
    • http://aquatherm-graz.at/files/28543093493.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/luzewulovuk.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/65656981863.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/6fc422c4758b7b6464df2446b176639d/7870457871.pdfIn PDF document text
    • https://tch.lu/files/files/30295345485.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/10456488630.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/142c7b2392787d71130ef6451864a562/wubomukekonudatifile.pdfIn PDF document text
    • http://fruitvita.com/files/files/tekolujewid.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/berojijagibafobuve.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbceb10ff7a---tuforob.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/65334660878.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/kajibofozozutanokaxanoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=lumix+gx9+manualPDF 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_off000102c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C8 20352 bytes
SHA-256: aa021895f5c3251ec0df70379ac3036ffa8aa7b54b4b3f776f240fddfc61642f
font_01_sfnt_off000138ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C2 10160 bytes
SHA-256: f9eb1a141199796f7b2f5ac4629034836fa632bf12aa26fe2553544bc58ed6be