Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae8616af056b048…

MALICIOUS

PDF

85.0 KB Created: 2021-07-19 09:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 43f29ea2b1de62b5d3194dcbd333c8fa SHA-1: 6373cfb0e64a8babc35d8e921c1071ff5bce1dd9 SHA-256: dae8616af056b0482e2091c66d68422ae23391c3e9265d437f3f3fcc1c8b8ae8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress upload directories. The ML classifier also strongly suggested maliciousness. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6r9k7rb1lgdcp4qe5ed5e6pcr2/68603222342.pdf In PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/kokavulorofarutajenor.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/f09da43494d87abfb5c8c05db3d3afc6/kadul.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec981ad9678---bazokikubibagobojomat.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/ebf86ca45fe23d3d98c3d5c896d42886/44014796964.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aade8697bb---89800007881.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/dizevanogobowefumaline.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/75237322607.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/nefawebuma.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/rewugikoponabila.pdfIn PDF document text
    • https://viratrip.com/basefile/travelasreviracom/files/26973071175.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/24407706110.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/wezufubudunekapun.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///20325104939.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c5ee12224---66042223472.pdfIn PDF document text
    • https://birudongker.com/contents//files/59111799447.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f55736bfb0---zidilaguvuzu.pdfIn PDF document text
    • https://patc.fr/imagesfile/30160117647.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/afkqm3v18mio3teggi3mt6df5k/68576264857.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160762998e26ac---12825654534.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/40048002505.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/38504763835.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d349ecffa6---23586770089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=leave+and+pass+regulation+armyPDF 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_off0000e85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85F 10972 bytes
SHA-256: 18cb7ee622ce9d00fcc2a17d0765d6dd62f9008f680b3aac42c74bff57d3038e
font_01_sfnt_off0001019d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 17056 bytes
SHA-256: 433450071a7970da5ecc8b879e217c86737c3c007328f81878c3c864056047f4
font_02_sfnt_off00012e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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