Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4b3ace3f160a57…

MALICIOUS

PDF

94.4 KB Created: 2021-07-02 13:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 31055014bedd19d6ceb6894fed835feb SHA-1: 1b4d8e41753e0a5731ec8e6176722daa2ec8dbc2 SHA-256: 3f4b3ace3f160a57718a89f735204fb45cfd21f67066e63265ebf791252c5cd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites, many of which are configured as link farms. One notable URL, https://allytemp.ru/uplcv?utm_term=ludo+king+mod+apk+latest+version+download, suggests a lure for downloading software. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://allytemp.ru/uplcv?utm_term=ludo+king+mod+apk+latest+version+download PDF link annotation
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608768bdf2b12---pugixukimomumepimepoji.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/bipawabagulileponogi.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a74a0779673---xumojojigozav.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865d4766c03---bezelituki.pdfIn PDF document text
    • http://phunhai.net/upload/files/85280910545.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1cf776e16---16474437488.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca0bd7419b---13655274895.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ec3d12af9---58224248755.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f67d8edb3---vazof.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/e751e5f3943951e71d49016c7dbb4a55/gidovenomowix.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/97699382664.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfa7e048b3---tenutuz.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/ae4c2638403d398d418b29f06b27f2cc/fisoxanelugoxifu.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/tuvepofisadifusudamep.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/vfcqn8ptnrhqecm9e1r5rh7tu5/53731813004.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079a650c68ae---51381158802.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/c5r6fmst56cbeir608h7ulh4dg/zutikajejepode.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ot81nbf3da7f7ha6bic81otung/39308083239.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/7809183109.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/53846453103.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/b0a0e9f62b85a7b7461f5c4c67cacf36/5443423129.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4985045fc---64149363742.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ee805bfc6---lakimupoj.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/56698573285.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-06-20/images/files/juwulepozirakiledesiber.pdfIn PDF document text
    • http://planetamama.ru/files/file/45947049182.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 11036 bytes
SHA-256: 699e345d0898d27057a979029ea3f4122696a85712097fe113ef5d28e50a6d61
font_01_sfnt_off00010b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B97 16304 bytes
SHA-256: 72b6d5534888ecec27fd68dccf88827b5fbc3510db23809d90398b76a33fedee
font_02_sfnt_off0001218b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001399d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399D 18184 bytes
SHA-256: 19f4a1b3171997ba9df55cd333b54ce1240dd613e3d19892d26ba27a0a3c4b0b

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