Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52abe5d0eb6f703…

MALICIOUS

PDF

100.2 KB Created: 2021-07-25 08:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c1af90f8bd15886a1decc407024d3464 SHA-1: 75c819a90ad41179bbc7800b20e1981f2021f634 SHA-256: d52abe5d0eb6f7031da1717646e2e26b721427ddac7a0dbe25be523fa8398248
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608345b369b33---50891167769.pdf In PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/vpv3od7gbucd9irq4a8ojcv077/webimexajobego.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/kijunezepevemasijej.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/jefavupevimave.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210510170722.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/maxepugulijatezewuli.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/j9303qmrtjvba4k14cu7qqos6o/zowavurabijipojetema.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/31a2452bc20d7e9a39af07a4f4171a87/bapikujevelitumebipu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd454dcb14---51333879712.pdfIn PDF document text
    • http://alhs1973.com/clients/64426/File/gujetaxufanarupipupami.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ad1f11c2775d9db66c050bd471785332/9953642840.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/7db6bff90f79997f151eddd91cd2cde0/6984698562.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5f6f6ba3c---demuzisaruz.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/sexopatuvigidanaxedewu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e30f7032e61---vixuwavogeb.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9892e95d42---dotaned.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4cfd708b7---delofakowo.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/68807287721.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/9104714787.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c97b67f18f---wonorupiza.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/89385758740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=what+times+what+equals+140PDF 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_off00011e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8E 19152 bytes
SHA-256: 10c2c6aaa16605d2f7099a0b9385f77d2ca8439c199e97af2925d8df5e88c4e9
font_01_sfnt_off0001510e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1510E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16925 10624 bytes
SHA-256: bc7be5f8fb102cf568fd31ae79f614c84bf1c5f8af30abbc7b8526df225dd4a7

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