Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b722d152628a53c…

MALICIOUS

PDF

87.7 KB Created: 2021-07-09 10:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a74e66eafdf9897e55692b2225b44382 SHA-1: 2c62144abddc7d7eda2e87f16f34a1e15a5a2149 SHA-256: 1b722d152628a53c6a75be644d5cdf62fc4c3fd866288bb852e9d774d306aedb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs, many pointing to compromised WordPress installations, suggesting an attempt to redirect users to malicious sites. The presence of external URI heuristics and the compromised CMS upload link farm rule further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://yingzhaoliuart.com/upload/file/kikobixeturofelupilawiged.pdf In PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089eb52298b2---miwifasaze.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/87310011428.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/bawewedixaporexezikasalaj.pdfIn PDF document text
    • http://mfahk.com/upload/files/41099763641.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d5e9fd3d---27748714117.pdfIn PDF document text
    • http://zuche0551.com/upload/file/48900482522.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca242ec53e---3694693177.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/9681b5e3791c107e8f021bc257546e1c/vusolodifowofajelipub.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6edc87a6c---20746758445.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/xanofetulakirelosidomapod.pdfIn PDF document text
    • https://chpcentre.com/files/file/16358449695.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/48574022731.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/18433749988.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/gavegujadeboralo.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/99e1307c1f72e4e1dbb4a74f0c640bf3/15512860773.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c668802fde---juxodoludapakolokevon.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/bcabb4e0ed661cbabd949a73c5318013/96043883764.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/34696388362.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9755f2ebcb---83649957679.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/cbef013be9286c5028a4b0c6a56d899b/lajisu.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210619_051750_3864.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21841070597.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/95554597901.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/tapawikozotifali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ruth+ozeki+a+tale+for+the+time+being+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C3 1708 bytes
SHA-256: 3b2665576e0e733557d54fd8b7ab9fbf951407a02dcda8f4f3f3dabcf3176750
font_01_sfnt_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 17284 bytes
SHA-256: 56df6ef3f9b7accd7f15eb47b7132c6b7d44dd93d1a15f931722294807adaa3b
font_02_sfnt_off00011ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13709 11212 bytes
SHA-256: e135a2481847257e1e470dcdf65b599d172f682584d6db89b986fc2a521fb883

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