Malicious PDF — malware analysis report

Static analysis result for SHA-256 852c7dee15ae80a0…

MALICIOUS

PDF

107.4 KB Created: 2021-08-06 15:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b57263e3d6d81ab5c6d81dfc71e952a0 SHA-1: 23ea97020e27f1d15985b2e483f273295e24369c SHA-256: 852c7dee15ae80a09e7857e92ee64cf2bde7e427d1896d10ad82baea14b54d84
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute or host malicious content. The presence of external URIs and compromised CMS upload links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/00a81323a369d6d4126bccf4aed5c323/xisawejigu.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce4c8a3cbb---nibili.pdf
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/61970557179.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0102c8905---20584837550.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/i66nv0bbtjjfdnf1hg9mo23lns/12963217256.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/tonizilupafujitago.pdf
    • http://karinameal.com/imgdish/files/5468762419.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/9f0fbf30a5fe7eae75e4ceead625281a/bopexonepijezol.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c04dce526---99649462210.pdf
    • https://buka.ru/sadm_files/76003383521.pdf
    • http://clinicaveterinariacene.com/userfiles/files/64600839081.pdf
    • http://solamsys.com/userData/board/file/janokoraf.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/hbdvjfakblu5imq9hvbpap3jq1/31430533978.pdf
    • https://aynispirit.nl/userfiles/file/56235099481.pdf
    • http://anaminfo.com/attachfile/file/62411851781.pdf
    • http://wsp.pl/userfiles/file/14864347699.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e876dc0968---digelawupiguxavumetusejep.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c330f292108---43587261387.pdf
    • http://asbufestival.com/uploads/FCK_files/file/50464522120.pdf
    • http://ozhelalikram.de/resimler/files/wusutozosexitakibaz.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a9b22c7f7---lovumolurukajilelafoged.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+evolve+your+pet+in+prodigy
    • 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_off00012838.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12838 16792 bytes
font_01_sfnt_off00014049.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x14049 16164 bytes
font_02_sfnt_off000155c0.bin
35d19d25d5664aafaca4f0cc32254f34e16e1ab5d5ac1b98e58540b82704c4f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x155C0 10592 bytes
font_03_sfnt_off00016dca.bin
b1914d2c03458cb077eed6eaf4f18ccd8aec09cecdd3ed8662fcc4847a7693c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x16DCA 18500 bytes