Malicious PDF — malware analysis report

Static analysis result for SHA-256 461fdd07b4bf6667…

MALICIOUS

PDF

73.5 KB Created: 2021-10-05 00:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bb8d32c28e39329b34491d527b4f55fe SHA-1: e8053284eac27baa56fac2d203039a0e67efaef7 SHA-256: 461fdd07b4bf66675e89e8e5935ca243130f14ee54a9af61eca33c7d5b8aa1ab
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=ge+element+periodic+table PDF link annotation
    • http://hengtongblower.com/d/files/siwewu.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/51482688053.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/95431684214.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/64f39495c876cfe54e07131bc68a74d4/mawemor.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/wipufatiliserudow.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/nebigufilu.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/21e9abe136bf0e72b34292233b00592a/14617260531.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/36044416429.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-22/75469abb95b35272f29ec70f9ad134f6.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/92997132214.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/94864943937.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/14638592759.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/tunoxebanivig.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/5b2d97a100c2414412931b95dede538c/pejidukubinerolo.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/80319778549.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/82588323687.pdfIn PDF document text
    • http://veitali.com/upload/files/nopugitezosoli.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/17/file/20210917_102457_199.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/pupesalelorisaba.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/95588534738.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/zubosu.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd23a147c6---roveramez.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/rozajibinibiguzijidub.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/rijeberomozuwafefeben.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_off0000bd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52C 10688 bytes
SHA-256: 96af6ea208904aa80c77a30365b4ef04ac90892b466ba287e300559d128f897b
font_02_sfnt_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 17296 bytes
SHA-256: 31fed704bbc9294c781c28d103cccab5bb9e32ac23035c207116ceeda6e67633

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