Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba2b07030082c97…

MALICIOUS

PDF

87.2 KB Created: 2021-06-17 23:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f2a5f76cf382608ebcde291efa0203aa SHA-1: 570cbec81fd1bfbf017b8ad0a4dd2bc9db184972 SHA-256: cba2b07030082c971ca8ca4db3035d3cc9beea5f0da1ff56a89ac13c218e55ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a phishing or malware distribution campaign. It contains numerous embedded URLs pointing to disposable hosting, many of which are hosted on compromised CMS upload directories, suggesting an attempt to obscure the true origin of malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or the delivery of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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 https://allytemp.ru/uplcv?utm_term=wbbse+class+10+math+solution+pdf+download PDF link annotation
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/a62bbfe69886a346a53c9d15338c509e/83679846661.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfed30d31d3---39098611661.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/568d96f39634c22660c6189dbaaf43ac/govizewebesolexe.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3139401816---rinukigokaduzisogesakuneb.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5384d3f1c---pelarelexaved.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d389dc58bf---77782644903.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/xojavito.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609666e4e97b6---88852473808.pdfIn PDF document text
    • http://mfahk.com/upload/files/68061570406.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/7749ff207602059144665fa8f63abdb4/zunerape.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/fe5ihpqneqghpgh71s1eosbm3v/91143618192.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a5681ab7d966b02eda567602b0809db6/ludovomagabaxo.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075fa395d0be---mawowusekexe.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9cc2faa91ff458198c2fac41d61e2064/25068329194.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/lifogufalibuj.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba5a4672a1---43298297598.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/45782448795.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD46 5620 bytes
SHA-256: e76c6ae3b00873d14558ac725965015eadeea5e786ea4c37fafc5fe7e6097f0d
font_01_sfnt_off0000f04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04F 7648 bytes
SHA-256: 459d5af5ca8aeb5f26a1dd0329ca96bea2baac2ca745907f3710e05bc8d7be1f
font_02_sfnt_off000108e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E5 11468 bytes
SHA-256: 99cfb1dccd97a0d61a278066cfe56fd2c2a8f202815c0563a5e259090d13fce5
font_03_sfnt_off00013037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13037 16072 bytes
SHA-256: 24c5c481937acf4f4841e6563a6d7a18cfdb810806c94b09ac0ff4033348c1e6
font_04_sfnt_off000144d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D6 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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