Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c9d525178022aa…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 04:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 16b601213e79e7b213cbbae2b7ebc29d SHA-1: a08b5622879aa1a3e6b46e75f6c117685d6dcfcf SHA-256: 44c9d525178022aad36302e601d426d63301aff8f8ac15664b302f02438a98e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161297e412493e---bogoxavotokebamo.pdf In PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/gulabe.pdfIn PDF document text
    • https://le-luc-braslou.fr/images/file/2457290943.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/bosominowenagulalib.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7fcbbec52---folajajoxurivaxabeb.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/kiwep.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/84301189365.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/tutebadovedofove.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610e64a082f5e---lujes.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/4c3c92c2a7752ffd9651bc2c0662af80/977571375.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210812004538.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43eea15680---67546250830.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/76495522829.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/1aff678ea1f6006ddf1886ed22b161f4/dewerudotap.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/16575538950.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf849b2e97---makoxetenazasadopaxa.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6284f1553d---tofus.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/kemexuzun.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/97e2fca9f97c91ef2a91bd1d09c66288/guvevovuzinalewad.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/jedanilunegopumevakezed.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160722ec763746---jiresutale.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/gorobir.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a46e4b5c145---tosoja.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/66752208834.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/nem5h0c6n8l7o9cuo5m7k8d2aq/37289249902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+revised+uniform+partnership+actPDF 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_off0000dc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 17676 bytes
SHA-256: 502e1827caba6edda0bc8a418027ca27c286ee0031f2c3390d266e629819b397
font_02_sfnt_off00012285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12285 10968 bytes
SHA-256: 3e41494fcda9ec3930de9613671039e67d62a712e5e60859ed4012d1519c99a4