Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1f7c40cce7119b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 08:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa75c7568f57d20eac90f79099c76387 SHA-1: 97d2ed8f8577086fb987f96c3b9ec82c9760ce25 SHA-256: ca1f7c40cce7119b1e0bd67587a12a0be7cdd70bb56f3629d58b5fc42474956e
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. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be redirecting users to external sites, potentially for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609696dc6caf0---kilaz.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/aa075af08f19b9ebb2045996d2762521/fudugamigilovukur.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/cd120880a1cbec5160aa84ed9fbb463f/87479010089.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/4n2srp4926cv6taf09jk0c9iee/dasufinovif.pdf
    • https://atl-50.com/files/file/danozuros.pdf
    • http://gibkrakow.pl/uploads/files/fivejenakuxeruj.pdf
    • https://rajatotogroup2.com/contents/files/xativuvukamufumimaz.pdf
    • http://sklepjola.pl/userfiles/file/gugemisigumiwugukiduzoma.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/821c4568b6c8a2c58feb88dba73efa6c/90800698857.pdf
    • http://www.sport-konyv.hu/userfiles/file/gujegulaluwavuwe.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609534a79d79d---38071287039.pdf
    • http://jarosi.hu/files/file/kebafazuxarib.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f27b2f2643---10232256629.pdf
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/gilomuwunakufijodaluzubod.pdf
    • http://rustproofingottawa.com/userfiles/file/judukutemi.pdf
    • http://kidneytracker.com/ckfinder/userfiles/files/gojixunasibubo.pdf
    • http://pelesiuvalymas.lt/i/File/31575670316.pdf
    • http://doo-san.com/userfiles/file/20210702192311.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ijcc2jfnqm6t1k95ffi9vodpv0/3042897266.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/d52vv0crvr0n9msfkudd75qi2e/fabas.pdf
    • http://selfmadefilms.nl/userfiles/files/86315069005.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/lubln4krct3p1qs2q161kkm2p2/fofokav.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=soylent+green+movie+worksheet+answers
    • 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_off0000d804.bin
02ea579813685cb89da53b5c4a7f8ca2c851acfa4487cd816f3e77c738100b73
pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 10988 bytes
font_01_sfnt_off0000f172.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF172 16792 bytes
font_02_sfnt_off00010984.bin
0bfa4c1c78c2a5466b82927a21577866f652381a9dfc4e7c2752fce48652aed1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 17920 bytes