Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa01d1c6082524f…

MALICIOUS

PDF

75.2 KB Created: 2021-07-17 22:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 71dbd0ec34697018e7212cdeff500e14 SHA-1: d1ba6c992ad070f1251b6c02b40f66c5c92d84e9 SHA-256: efa01d1c6082524f887980745701e75950814e809409b12766214d9ebfeb90f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The sample is a PDF file detected by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress sites. These links likely serve as a lure to redirect users to malicious or phishing content, aligning with spearphishing attachment tactics. No scripts were extracted, limiting the analysis of direct execution or payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073736e23395---jagapupijaxarivumivutaz.pdf In PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/luvusuvekafugesikevo.pdfIn PDF document text
    • https://emprenderem.cl/files/20163791780.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/komozimafufalikijenejevi.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/fibarabinonemamugoguwobis.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/telidowo.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e55d1c75510---koledenasaralijogugale.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/0io340r933019p672k93bviicu/napanasunadijomiwisumim.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/32617488560.pdfIn PDF document text
    • http://bjjiffy.com/upload/lujonuposivuvew.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a5589d493---51328492916.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d61c723e0f1---95360424961.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/968151709a4dcb3c6bfa34d88b29c76b/gerizukafusegukujisevu.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/vexoxomixupudigezula.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/60291435364.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a943e0c1124---29673067811.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/kahtcoh35tguh4srdbrorq8p46/vezemiz.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210608220532_6zawmj.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/zudisejakepejijumelin.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/613am9uk5iopt8i6s1n41h3dn3/89028281599.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/nonazetekepunam.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e4493ee1---20916286120.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/go8ds7718hd8grkdhp2qleglab/ratini.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/sekumovavawiwebisoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=even+numbers+up+to+100PDF 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_off0000bfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAB 18364 bytes
SHA-256: 9db6f2c5e4eb5c411a7963d59c4b38d73bba462ce97c43283fe35b0f7306bed8
font_01_sfnt_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10608 10576 bytes
SHA-256: 472d19a74453241b0989ae281062c6d3e05ae6da6a35e0f6cf065f49ffb60025