Malicious PDF — malware analysis report

Static analysis result for SHA-256 eab3aead6e9dd431…

MALICIOUS

PDF

84.8 KB Created: 2021-06-25 21:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 603b5b78be144b803eab52af0459f912 SHA-1: be688514b4401092a71cc7e7eb930b4638d73101 SHA-256: eab3aead6e9dd431029e4bec23a1663e819bd416a64109e6c63837406a09c5c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with multiple URLs pointing to potentially compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farm heuristics indicates the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ceccargiurgiu.ro/userfiles/file/33250620145.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096b9134d4aa---77826063011.pdf
    • https://shellserva.nl/docs/Image/file/68347794275.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa28982964---semajemexe.pdf
    • https://superpart.com/files/ruwasunamomosukosured.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607462d438f91---zigokuvoxetatafopopube.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c41da9c01---zuwutomupibiv.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16bb95e2e5---binexubafivub.pdf
    • http://mebco.ru/images/file/subolubazojujud.pdf
    • http://www.ecostroyservis.ru/File/30054079856.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/63j4qk1g1b33qt42hll2vi29u1/masemokenuxevatovixomuzux.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805501afe2d---ruxan.pdf
    • https://soechi.com/userfiles/file/21780931037.pdf
    • http://anjilh.com/uploadfile/file///2021042905371245.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ulfqahc3d1t6419t9ljpehekpb/fasuxuzokevirelujonozif.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/qd1fckr9h3q44l9ba1m2fm7cd7/tudubagevugoxojadowu.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160725991bb978---64276116886.pdf
    • http://humanitool.ru/userfiles/file/desodanusubel.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/76286cd64a5603e662c0700d2c04c3de/kulazefiwodibuduzez.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/779e75600094edba073e891fe467c80d/98841100564.pdf
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210615201311.pdf
    • http://epmachine.ru/d/files/79202806536.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/4eif2on9u2mtu3j6n08ljm1fsp/sukolojuzefu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2b1f52fb8---zosidowibemi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=rental+contract+renewal
    • 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_off0000e60d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 16792 bytes
font_01_sfnt_off0000fe24.bin
f2c9dc3e9cd71de984988e4734614934e38ae510d3ea11624435ed2fd044de5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE24 10096 bytes
font_02_sfnt_off000114db.bin
4b7dd50c7380d4c008a8bda941e96e73d07f868672afa797db007eb1c12530fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x114DB 18040 bytes