Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e04405a225f8224…

MALICIOUS

PDF

76.9 KB Created: 2021-06-29 13:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b06661d6074dfdab6d9c2ebff72b4a6f SHA-1: 37d3a884c0f9af17b2b384882ec72f8711956d2f SHA-256: 7e04405a225f8224aa559740616164c769863c076f9d14fb1a24c4bf65d3fd7d
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://cubic.is/userfiles/file/mozofi.pdf In PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/jajabiwuzesipaxi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/wifusorowix.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/9arsbdkf9omj7o2qtu6a91oc97/tewotibazovobax.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/9c1922200dace20f850b3d8a1dfa659b/viketeleviwitelirelekaj.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/2aa7f5cfe933c01c6cbb331235405dcd/29280548724.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16078ad41d0c33---duforekabokifazolarizis.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aceea4c1695---mixeburoziripasotutugebe.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b08b53d171f---19810521368.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/83621910137.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ac0b1579a131a2e2bf6de41790b0e532/44136845109.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2117a0fae9---25367617101.pdfIn PDF document text
    • https://penal-garazh.ru/files/15349870627.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/222ce8a9e6a83049e0deef76621272d0/99432526178.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f172837d4b098a5d25fe2f8b73f52bd4/7408809241.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/dexibojituxokubu.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/95569568322.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/xigid.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/farenutukesojujovuweguf.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607834ee40802---wejupisumigutapupudud.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5ccc276a670445d6b90a26ba61873356/2239242598.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160893372d957b---wamifosejol.pdfIn PDF document text
    • https://flyags.com/editorResources/file///25267060401.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b120cc43a3b9b2e03bec0a13b0d5a871/revisowarikejulozem.pdfIn PDF document text
    • https://anfauglir.com/images/file/99191578673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=serway+%26+jewett+physics+for+scientists+and+engineersPDF 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_off0000c895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC895 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 18892 bytes
SHA-256: 60d206deea9b6e5d373984aba22b8d39f9f7f198f74b363557a1d8af553e4882
font_02_sfnt_off00010fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD6 9740 bytes
SHA-256: 0d5dfca3ee32c6fb26e530dd1096371d39b83e43639f0f8d126d35abe8de0c6c