Malicious PDF — malware analysis report

Static analysis result for SHA-256 9575751dd9904622…

MALICIOUS

PDF

75.9 KB Created: 2021-06-28 00:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17e21074a6d1bf2bef7e728ea2bc82fa SHA-1: d05fc0b1aa37515062e7ad6e3aa6a4ddffc4c674 SHA-256: 9575751dd9904622eafaba40ef210dadbf4e46940f78b198e604018abe3383af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to exploit users via malicious links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://crewmak.ru/uplcv?utm_term=cher+are+you+strong+enough
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608531305d7e9---42964421261.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ollfqnk4f1fbri9aoapqhmeb90/76107033632.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/56ae48d0260e9a9ff95b9fccc4eaa2b7/28590115865.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8c4e15e664e7d84a054071b5b9546509/xozezowimojavuzize.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b8998059ef38f72795b6da1a9d8c0cec/63987743813.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c245f8b0fe1---72755042209.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c228e83630---bobeposab.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ht0jrhcsq14ua0961t5dqqlsmd/bozupezufiridororebibaxun.pdf
    • http://makesomenoise.hu/upload/file/98690847460.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16085a8e9dde57---70105097776.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160adb8bdb4bdd---3899096624.pdf
    • https://zlatartopalovic.rs//files/lokefamibimufovefulaxov.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609202eda16d9---25225303069.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/fc2b981800770bae08ec2a194ffe9c1a/gugolopajanalanajif.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25b0c9096e---79670450457.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3adu9afok12lttpk311q4p86pg/rilonifuvozikerezaluz.pdf
    • http://extracam.es/app/webroot/arxius/file/94168285083.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a977030da52---76284736721.pdf
    • http://automsystem.com/UploadFile/file/20210511113424805.pdf
    • https://fidelishospice.com/ckfinder/userfiles/files/pukizabugozokaselofiz.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af5c11e37---taraxa.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdfb.bin
9925e495c97abec1da5bee3354cc7541865972585bca3e5b2d0cd9ed5ceb12c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFB 10496 bytes
font_01_sfnt_off0000d5e3.bin
9c3c50ca7885eb1b87261f6f74ba185aca171ae216209544253fbc3ee3acc073		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 1720 bytes
font_02_sfnt_off0000de09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE09 16792 bytes
font_03_sfnt_off0000f61b.bin
823d590f4093d39e8229072faee3fa538f63c07ce811317935e981ef7dcfde75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 18564 bytes

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