Malicious PDF — malware analysis report

Static analysis result for SHA-256 39860285a517c9f1…

MALICIOUS

PDF

75.3 KB Created: 2021-05-27 17:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c723d11107d22ae0aebd8444c1a12c4 SHA-1: 8cd74a5448c78150e2c0a631ef7ece06ec85bb26 SHA-256: 39860285a517c9f1ecd37d7dbed925f1f1ab587793f19b53352ee424da928689
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm with numerous URLs, some pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of these links and the overall detection profile indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608133faf05b2---xikosa.pdf
    • http://alnadaoil.com/userfiles/file/dusalabirebesimerejiwuve.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/85576534881.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/e5438afe394740dc9d8bd30dc77f7be8/dibakosix.pdf
    • http://j1medical.com/uploaded/file/famuwijuzatipotodejomorur.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609958f397ad2---fijotajon.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609227499fab2---jesakevifegi.pdf
    • http://slsnn.ru/content/file/21011008855.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160733250ef0e1---98815610857.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/sonipijidoz.pdf
    • http://alkanboya.com/files/file/%5C/21481999431.pdf
    • https://anmoul.com/userfiles/file/sasobavowosiwijalitepodek.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/8caf0c73c71c0901d0471505299ee879/vuledulanuvitol.pdf
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/d4f23938c68812f79196c1f82d51d17a/9992041312.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085acdebfae0---foritesu.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/ad01416623c9462c51fc1d9b110e4e26/fevab.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/alh1v3o6vka4kbo207kupiklc4/4989490475.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=are+aprilia+rs+125+reliable
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e63a.bin
711cb3a48744c63b3ad99e5a0613f455d5b766e9b2f5a92df25a863531625963
pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 5248 bytes
font_01_sfnt_off0000f825.bin
509d480cfd2f3112e3feed05a9002dfd144434e18f897ec9e4ec29d21410c4ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 11528 bytes