Malicious PDF — malware analysis report

Static analysis result for SHA-256 359ff4235737a6ef…

MALICIOUS

PDF

81.6 KB Created: 2021-06-27 08:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 79d65f4a13cedb8c5adb91faa1348d43 SHA-1: ce6e4e4e776ba9d48bcabfb8c997c1ad0d946d89 SHA-256: 359ff4235737a6ef77172e89bf26b4e87ccc76742cd8f383a4b5da1c6c03a48a
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to compromised WordPress upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://ketchas.ru/uplcv?utm_term=oral+communication+and+verbal+communication PDF link annotation
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d39883182---90819034830.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f1a01652b8bdaa719d2fff47a5ab29e9/97723951023.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2ab6ad04a26d4616cd4c2fe1e428c350/62719995269.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e874f41961---fujureg.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/nonorefuna.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/c332ej8epf9d0prk5p1uqmcqb2/9391197091.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608206cd6749e---kifafabonepadetorotox.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/35erlube8p87n4imuq107fjklm/64174823732.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45d900e7c1---pitegad.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baaa507aee6---bokopejotiloxedubivo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/67668828707.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/1853f1e43bf214768fad99fc88b545f8/xavufebaviwoxifarid.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bc004f03e50---ropasovakogivunepe.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/fudov.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/270745154969.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/sajobazidazasurotewokibak.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b02dae1973---17731051531.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/pgbg0ktg1mkg1380b85o7betf4/16954998691.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/63107748739.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/dikowasaxuvekowenima.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/84620268328.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/39186237639.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/xexufujavasasolovufa.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/25502430500.pdfIn PDF document text
    • 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_off0000daf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF3 17048 bytes
SHA-256: 5a8fe4568d205b424e3568a8073a40eb61f728731649da608caaac557ec95adb
font_01_sfnt_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8C 10692 bytes
SHA-256: b7c87b2408ad6e1423a7cb270189295575369599d150b19e7fe2f12c45f31d21

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