Malicious PDF — malware analysis report

Static analysis result for SHA-256 e137cdc9d816df85…

MALICIOUS

PDF

76.5 KB Created: 2021-06-27 04:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e86632587476fefe5c202f58d8a8295 SHA-1: d302822e1af6e798e44b5469f2e54a2c8ccc255d SHA-256: e137cdc9d816df85c615e837518eeb327f4c6495da15cd679849c4650702c3bd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous distinct hosts, many of which appear to be compromised WordPress sites. The primary purpose seems to be to lure users to these external resources, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://ck-kutnahora.cz/gais/image/file/linetanalagoluwizix.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb7d41e197---29888975085.pdf
    • http://lblussana.it/images/file/repigavos.pdf
    • https://chiuman-hk.com/images/file/67839116495.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b97022180e5---20602558292.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/576d18cc50dcd45b4787d9127cad3619/55409036389.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748ce143edb---tixeratimu.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094160b65814---wigupubusezemimo.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5f5e729aa---24350357258.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8d34ab47ad36e1ae3b5490a35a0eb2cd/wiletekiganijovivej.pdf
    • http://eortak.com/img/fck_temp/file/puwibedipuxapere.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8919210fe---45119072696.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc72d89ce---duzobazawivupufasupu.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8b325944b07c16b34ab05b37f9bb0581/24052026007.pdf
    • https://pima-alarms.rs/slicice/file/77351059712.pdf
    • https://tessuno.com/upload/files/60d5851a8c552.pdf
    • http://coreaad.com/DreamDataUpload/file/70929868827.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab16cdcbc9d---kimepowoxiduxukozalunek.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a2d1e2fb4---sepuxukezebipapitili.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd2c7e7acb---jileji.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812a91d2811---xetusupulafosedu.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c149183471---kaxis.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160817fc8ef001---zivabomopamedegu.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbca2fadd6c---97457358607.pdf
    • http://feast.to/upd_file/71580892129.pdf
    • https://telenovella-bg.com/files/tubenuve.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=isomers+of+propanone
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c483.bin
eb7aa523683bdafdbba5558d29ddc6c37cfc1235719a0c443a29784b9d0b5207		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC483 10236 bytes
font_01_sfnt_off0000db74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB74 16792 bytes
font_02_sfnt_off0000f386.bin
7b37e142549b0c0939a624825f4bf3f9cd72adb6c3d37ffd47e85efe40f3a9a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 18228 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.