Malicious PDF — malware analysis report

Static analysis result for SHA-256 620abc36b1aa1b2e…

MALICIOUS

PDF

194.2 KB Created: 2021-06-15 10:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 08d3d31b68683a45c33458d72d2aa6c9 SHA-1: fb9614c605d6c3acbbe1b22597fce70a36e9a2f4 SHA-256: 620abc36b1aa1b2e5b7cca7a7957c2445dcc6b2f948fe1a493f5c920c800326c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded URLs, many of which are designed to appear as legitimate file downloads but lead to compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically points to malicious content hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9695

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crysiq.ru/uplcv?utm_term=sai+parayanam+telugu+pdf PDF link annotation
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ebce56ab4---jilinovoret.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/aqnth4nhu58bsi3ltbfsqj71ao/jewovizugowegeta.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/wupakobabezikefexawa.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/88621006795.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadff170707---tiwekusakajunibevopi.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1758ec1b2---diwalimonuzubotanod.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/49541066815.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f2749a4de---nalexa.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/wefamopelekesetawa.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fed759e31---95186840230.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/ac9sfh9q3gh5hnntr2749k6f8r/sagimubap.pdfIn PDF document text
    • http://changdahk.com/upload/ruzima.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/jagujositelozejutiwat.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/742e70ada2d865b64e640f2b65da3b7a/59237095591.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075398b8d239---38321058812.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d68bf15bdd---41194309049.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607588b779ba2---55370356621.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160733c35bbd51---41525879921.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000255c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x255C4 5160 bytes
SHA-256: 10f19c411f3553d76fe68469e534c7e9020b257817d201361ca6643a9fa34cd4
font_01_sfnt_off0002672e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2672E 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0002728f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2728F 11912 bytes
SHA-256: 77bd2e75e8e93ff8383025e640d0cbff2d3c12673aa0eb2fb882662dd60e7561
font_03_sfnt_off00029282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29282 11404 bytes
SHA-256: dbc6439eaac4b33fccac1a544de5446007b32345d9eb7b415fecac08e3407970
font_04_sfnt_off0002b96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B96D 16228 bytes
SHA-256: 2c9f402c5a8e52f0ce4c91514bfe76f9497b7e43743ba2dc95ddc8211c6e7ce9
font_05_sfnt_off0002ced0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CED0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
font_06_sfnt_off0002dcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DCD1 7860 bytes
SHA-256: a63dc08805a3afb7e010ca5b0e6966ae9e2a69dcb1999a2b7d3f3d9d910563b6

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