Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f5e47cc87edca7…

MALICIOUS

PDF

87.3 KB Created: 2021-07-04 20:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bc686c25ab0b29799467d08fd5941b3f SHA-1: 7b8e55a291bf574b422ce965c02f3433a76ae64b SHA-256: 39f5e47cc87edca70bc6ebae3a94d465e8449f06d777803dfc7acfbf7184ef9b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, which in turn host other PDFs. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploiting PDF vulnerabilities or delivering further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://fontanarosaserigrafia.it/userfiles/file/84399565666.pdf In PDF document text
    • http://artecgroupservices.com/imagenes/file/zasoludan.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/tf2pf5bbli80k0i73c69vbunbp/zewid.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739ab3509f9---sanekukifilogajupokugab.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/90528494138.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/mujeguge.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/jonuded.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/lonusafijukobo.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080321b4aea6---kimanejopu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071530eaab14---94912870205.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/70113679211.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bcdc31534---piteleloxamukebojexo.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ad79a5759c0---saxokim.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/pivajabilusoxofoguv.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/33372639231.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/lanatujulalijolud.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/ia7ik3ofs02q35evjuj254oqaj/gasoguvuxi.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/h1k18brti6mkm6vgd82luqv0oj/29372279922.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/e2e61d69e60988fdc74f5d2160be27d3/mudenevuzipurepufu.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/hbbkfoku7eg9il1c2hfo5tjmi2/41479533433.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093e5a83dc3a---gopagusi.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/75510571294.pdfIn PDF document text
    • http://ecologie-energie.com/userfiles/file/gejuvodofiverimuzuxoken.pdfIn PDF document text
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/xuwepulatutapuduf.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090b80371609---27112708817.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/51373419305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=two+party+system+is+badPDF 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_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 10708 bytes
SHA-256: 0913a06c88fe754dfb546129719c124f85481522fe9a036916d130ec715c13e2
font_01_sfnt_off00010a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 16888 bytes
SHA-256: e6c36df9ff8fba3ff9fba299284eee12fb1ed20a1a82930ff4219cc91e6a786d
font_02_sfnt_off0001363e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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