Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73e7017275b23e8…

MALICIOUS

PDF

84.5 KB Created: 2021-08-19 05:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5210d4d4e7931d8057a40d9d204493a9 SHA-1: b3142968760451322b4ff5d434c3c57566d11ab0 SHA-256: d73e7017275b23e8d42d49b2202c44391dd496f1ed8d4965c028819c87d7da32
176 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The presence of PRC/3D content and a high ML classifier score, along with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests malicious intent. The primary goal appears to be redirecting users through a network of links, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://mmgrowersg.com/ckfinder/userfiles/files/dobugelakesadex.pdf In PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/9mftioe6ragcv63akuu9f9780n/vonegesoxomogenarawagen.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/49758276241.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/mufok.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/55f0ee2bf231a21b8678954c998a8a63/legitafi.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/rekesevagufatav.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/8r08a6q3hqk6j3pq4bbvbovlkl/xunasasizoxuvadabomozodav.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/nosopisewuretumijijik.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a846bf57636---98505691934.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/fovowukatiforekofoxer.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/vajodujubigureza.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/85577543255.pdfIn PDF document text
    • http://bluiettgriffinwilliams.org/clients/2/2a/2accc941c041fffeac9751862bb8fe41/File/78330902753.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/74041446598.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/xajatusovuse.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/werunufi.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609877b5b6388---vabuzadugilin.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/34790154706.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/40642228553.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/bafotuxogutud.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/gumuniwojepuriwafo.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b97e162d56d1aa8bdac265d857d60970/21358899333.pdfIn PDF document text
    • http://sam-global.info/files/file/38102984721.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a176358213fb8ec0d0b7c2ea49931252/80345373529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=is+the+g+shock+wr20bar+waterproofPDF 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_off0000e41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41A 17448 bytes
SHA-256: c09a67c500f55aa93ac466e2beb77b6fa7db6bbe4a44ac553c7b2457b10f989a
font_01_sfnt_off0001120d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A24 11028 bytes
SHA-256: 14bf26499a900a2e94e1986921198d3d68becffcafa80e92e17b7fc78e7cb022

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