Malicious PDF — malware analysis report

Static analysis result for SHA-256 af72a05b93d75e01…

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 21:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 128ae4bbe40cf27afd03452bed88b013 SHA-1: 89eed40a6d60affac289a749042da5ba95c15921 SHA-256: af72a05b93d75e01aa54b256ca4cbd2a2d53c7a717af71dcc7afac9b82338301
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf955b0ff7---74771518196.pdf In PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bfb9af25c---futelowizexekobiwuzogim.pdfIn PDF document text
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/jusezigovafan.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/jamoniwugalafunejibegoz.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/20fc579a5b5ac44643f2eff1554e043c/fabosetamisekaba.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/miwusubipexozodofazulo.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///pepegawutogagonab.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/68066117880.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f81b7f71654---negoxopazalajagabuna.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/pos9ddbppmc5k4kiak716u6787/51103409655.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13aacaf552---judavobuvaxiwapun.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/35668717973.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/4313664932.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/58507469515.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-8-29/20210829210304244008.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082211fe301d---7869345944.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/73971868516.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/1e87d648a7a623e756917d9317cb67c8/sikezulamifovojezozodamez.pdfIn PDF document text
    • https://12shio2.com/contents//files/9293299201.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b2645f425---20808468520.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/raxedeki.pdfIn PDF document text
    • http://nothingelsematters.net/pharma/images/files/manirove.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e55f6801db3---tujaxalobidosuf.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/78570483160.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/feneluzarapeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dilute+solution+and+colligative+properties+pdfPDF 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_off0000df75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF75 10960 bytes
SHA-256: bf8d62650c1129884c60fc9f7b0b99209f739a52db4efe87d0546b6aa0c397f7
font_01_sfnt_off0000f8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 17668 bytes
SHA-256: dc6a93fff6f363d184cc97dc9a37993356b8948eb19f2e29446bd949ccb80097
font_02_sfnt_off00012721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1