Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fe19d10e975284…

MALICIOUS

PDF

98.3 KB Created: 2021-06-26 06:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a10fe7fa6bf94e73e02c0b01cdbc0e5e SHA-1: 5cb2c3a5efb4bdc59bd9047302bb2149b89d13fe SHA-256: a7fe19d10e975284bb645b7ece8aa442cae85891abf962b5d1a9412ffac6a7e3
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. ClamAV detection and ML classification strongly indicate malicious intent. The document body is unreadable, but the presence of external links and the overall structure point to a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=1998+ap+calculus+ab+free+response+answers PDF link annotation
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/75a7615deab0f5854257f20aade617e8/23865397933.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/6gqa5hncraa8s6eeefgp6pl2nc/kanoloxa.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/85529814851.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/6baa3d465e9b3a6e37c2bf01fbfb1111/pixupalizoribavufekeneju.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf471163d08---gujewopajaxefud.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/aa8883cee290fef51c2beeedb1fffdd9/puvaganireloxufomab.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/47e27234da994691f1f4d7024ad7e70f/wizonifufewatawutuwo.pdfIn PDF document text
    • https://samowar.ch/upload/file/kuxoz.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a737c99b488---98504953112.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac170795b67---53208210767.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16092a83a02f25---titetawiguxodezeguwemaz.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608a123188b58---10412208233.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/4uq9ea4vpnv5m88jbpagll3eud/dejuki.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5403a997---gisuvojeguwo.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094d19b3d1d5---riremizojodeguwo.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/60386785541.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/91ba83a9b98551bde4514febb9bc4bc4/dazibixawa.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085da56bbc67---safefoxeg.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210506041706.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/gamakuzazetuvumiwulitaman.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/a031e9a222a51979e3e7453b9feae6b2/levukiwebepudi.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/70560608948.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_off0000d802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 17216 bytes
SHA-256: 4e62ed06f404da6421bcaaf1dd80f3688e0cdf78c36a0500c468a136721c29eb
font_02_sfnt_off00011d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D03 10940 bytes
SHA-256: e9ac21552d6f2d92bf0b54377720f32dc2abfc50eef568e0f2e6f698d623c073
font_03_sfnt_off00013660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13660 24028 bytes
SHA-256: ca39f5c1f7800c7655173067ac5739b3470fc08df9cd1aeb3676c8b3442a07a9

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