Malicious PDF — malware analysis report

Static analysis result for SHA-256 1874e301256d510c…

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 15:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 670e9addebdff2d7820b7f544d6a2ec0 SHA-1: 007dc50871c5f6b2cf7b51d85ed2f3b85fd1c25a SHA-256: 1874e301256d510c8808f7ff2639d4e520814de0aae0a9055d142e37ce49a5a1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest an attempt to exploit users via malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pistant.ru/uplcv?utm_term=netgear+nighthawk+extender+manual PDF link annotation
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/fuqrgg3gvrcdkq1t2m0s36omn1/77860986993.pdfIn PDF document text
    • https://bem-sa.com/img/file/81161458250.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/paruk.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f1471b70890d42207beb40a7a0ffc610/16784382812.pdfIn PDF document text
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/9i8s2hqqoso0j8nmglbcqqdm7h/9034008520.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/15172883201.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/zuzuf.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/d4c3b32617501746fd37dd5a0f3c3f7a/mapowodenojemuwexoj.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc5e081b32---10350800681.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/22398351537.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085069dd627e---5581480343.pdfIn PDF document text
    • http://biosite.ru/images/news/file/tokeremil.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/12141656268.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/87eb166165d6ee089035f6c89680e760/98898459963.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/ed8a1fcfd5f29af51c5ed291c911f7e9/55823319324.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/kazuxazeganatanewafovufop.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/95349295664.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922c7e33221---doviduvo.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/vejigurixogubojupewugib.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba764901d---jikevomemekedowakudukogit.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/71068742113.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/gd31cm37bnbt8mmcnr1eavjp32/97657081464.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/19959693983.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/vodipapuwipebutejow.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/likezoripuxulewanedakedat.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/lurolovo.pdfIn PDF document text
    • 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_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 17692 bytes
SHA-256: 86dbd651dc995543b9aa80b0f08f67cf630689bc9615899b33b98943bab0517c
font_01_sfnt_off000114cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CF 10764 bytes
SHA-256: e63c23b7d2026f947e9fe4a08fead2394f4398b4d194ec60b796c5fe40ed34ff
font_02_sfnt_off00012d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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