Malicious PDF — malware analysis report

Static analysis result for SHA-256 1622449429070312…

MALICIOUS

PDF

85.4 KB Created: 2021-08-16 18:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6895909452583a9ef259799c2eb76e98 SHA-1: 27617adc51e43f9d0032e79a1bf96ede03844ff7 SHA-256: 16224494290703127c91f0b8258c87aff6294b70eebe4b726dc0307d0195a974
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609046321211b---15565935817.pdf In PDF document text
    • http://papianiarch.it/userfiles/files/vobelo.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/27su88dfgp4c432cvtt95mfav2/monixitetobasidowalajaxe.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/pfcg7gg2phtftnhn16e606q1i4/17851173751.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/4eb82ade7fa7e65fb6be7e84f9c60cb6/58876971032.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/p3f7fht58t4c4f5fnvluvke9a0/78199243793.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3426de5938---dikagotinok.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/wojazujozuzemabixowika.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160f4dd9f12541---50823792730.pdfIn PDF document text
    • http://edeins.com/userfiles/file/lekepebuginujoteniboso.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210710112502.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/26404142389.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/xiloxagudofog.pdfIn PDF document text
    • http://jcpingie.be/public/files/96998729828.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3136b35fb65c3bcbfddc2ee6192fc546/22116289780.pdfIn PDF document text
    • https://badoza.net/userfiles/file/68415642868.pdfIn PDF document text
    • http://yuha.be/_files/file/34589592549.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a675c18aecb---43198359465.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/27626751246.pdfIn PDF document text
    • http://llux.vn/uploads/files/xojomibaviveboduwifudiwij.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b601670252---fulefajoliwifete.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/numew.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/ramixamofubuwanugenaboguw.pdfIn PDF document text
    • http://giga.sk/storage/file/81570210200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ver+pelicula+juno+en+espa%C3%B1ol+latinoPDF 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_off0000e8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 17280 bytes
SHA-256: 449e8f654a0fc03b78cf37d1add9e3c70484ad3ba08c8f6e2fd6d9fa2ed903a1
font_01_sfnt_off00011499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11499 10772 bytes
SHA-256: a7034257874b85a9c41eef13992466708972e3c59870574654e4ca2a3a301184
font_02_sfnt_off00012d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1