Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f319c650195076…

MALICIOUS

PDF

97.5 KB Created: 2021-06-28 21:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0077db583197ce2ef0c5efd158c143b9 SHA-1: f6f7530611bdf52d8856bc9fb9c238885a8d4b51 SHA-256: 84f319c650195076c05b5e3a1819402cfda742318cab5b7e5b30685cff92c8f2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c89eac1a4bc---balikaxumifuge.pdf In PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf3782b857---31086029063.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16087990d673fe---42462217061.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607755c7bd8f9---tojifomewa.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/45124393116.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607729ee77910---satanozelolev.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f6c78d352---bumapatazupuxomum.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/dujupipadegali.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/14514608407.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/ef5db22824f65e9af3f4b644b3bb61fc/18510238952.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a871e5c70d7---17054746582.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/4ec79a5b587feb841d4d67b04dcd8ccf/26771793094.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/19970778753.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eec510586---litelusomozutowunawi.pdfIn PDF document text
    • https://inifd.london/uploads/file/24456073529.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808817b1e22---53743813489.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/gavakafigulojal.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/kasubedebirarigijop.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/6548581974.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/rlk97up7i9anlkff0csp2bqfk2/60908678740.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16088195143c71---7337502285.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/31de76f8cb2c381fdbfa13b4bb481705/duzus.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b1e34a56c---sukemubafepamuduzigam.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a64b409e80a---44439436448.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/03d60dcf88a0c2bd1df4e76d46a87911/gigalenem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+meaning+of+humilityPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A70 10572 bytes
SHA-256: 07949c3096e334db86fa5b340fb39515662695acfb569a143f90243c7a517d71
font_02_sfnt_off00012260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12260 20028 bytes
SHA-256: f74340cec16d925c20b980c844914df1cb921491ab2dd8654df5e736feb3b12e
font_03_sfnt_off000154d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154D6 2812 bytes
SHA-256: 3a34d1f1b737fe7db4e4cb210b5177958592e595b6e66830f263912685a1c87d
font_04_sfnt_off00015ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FFB 16692 bytes
SHA-256: 5a230f5e5632118a97fff69abb74d0a9b2afd592a3a55702065777805cdf8a5b

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