Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e1a6b5c33306da…

MALICIOUS

PDF

94.2 KB Created: 2021-08-11 04:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c2ecc11f44b26e1dd8477c2b4e431942 SHA-1: 856faf2cb131609b88d778ac5ae17426f7eb4e02 SHA-256: 53e1a6b5c33306dac2c189fed3cd54ff5822411eec052d0cad21de180e023d2c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the structure and URL patterns suggest this document is designed as a link farm to lure users to malicious or compromised sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • 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://visionbrindes.com/admin/fckeditor/userfiles/file/86587861634.pdf In PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ocqu7eps5d1ov07md2q0e4jmvh/72753086853.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/laqtcfj9bnttfavnca0lqt0q27/95974273448.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/n3vf0t2h28knc2hv3qnapia393/94607824982.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/rimele.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///bodejipakef.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e437763d3---31606125055.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/2cfec57815e4cfbff5b994408d7d5d1d/37406053670.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/5940664211.pdfIn PDF document text
    • https://rjpexport.com/files/gutorekeserexofuziwududuz.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/tekij.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/af791b4b1bb6f3a830dca9c25ac03e70/19457970133.pdfIn PDF document text
    • http://aqcons.vn/upload/files/zobizorifulivuzu.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/bojuketovipolotun.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/81710098149.pdfIn PDF document text
    • http://17njl.com/userfiles/files/siwoxejap.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/13729805877.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d7367ce23---36028738867.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099efe0c7c84---terizotavoxafefuka.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16083511b5b8a6---30635867794.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e029d5803---zumovididelubumafonagis.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16086dc0f6f358---wifewotaminubaxevixopebi.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16086566b6900a---jegibepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=one+booster+-+antivirus+booster+phone+cleaner+mod+apkPDF 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_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 17180 bytes
SHA-256: 297c70e66d118d7d0e9373b5a1c49003cea22ceec51b34a2b6335d7d2057b7d3
font_01_sfnt_off00011956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001316d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316D 11236 bytes
SHA-256: 59222a5ad54b01790819b2fde9e57ea4af7330cd46d4218e9a6e87afdccec78b
font_03_sfnt_off00014b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B6F 1668 bytes
SHA-256: 0a4af374cb035e676210909e4790276a619635896d879aefac6ffd5912e9aefa
font_04_sfnt_off0001535e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1535E 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467

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