Malicious PDF — malware analysis report

Static analysis result for SHA-256 49fd52a28f5c1e6d…

MALICIOUS

PDF

93.8 KB Created: 2021-06-25 22:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e396987c8c43a67a74967a075b2574b6 SHA-1: 2dc448340a824c1811131b9c0ad2dbca7407a405 SHA-256: 49fd52a28f5c1e6dfb7e2c8075f187e831d22f8beaba495a50c854556f41568e
164 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised CMS upload storage, suggesting it is part of a link farm designed to distribute malicious content. The presence of a 'download' related UTM term in one URL further supports the lure of downloading a payload, likely disguised as a game hack. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905b531a2f7---96891529524.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/73745bg0tsvcqd6j7eo75eugn0/17004580973.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/79ae947ebabb43575dac88eba89401b6/jakos.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/540ca8fb3af2ffe0b514a1caa03bebe4/30231084541.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/bgc3rvrptvf364m08rjlfci03u/zagodatuxatuwuka.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/aj1mcnftg2ko9subbbs2ctd5lm/4942066254.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4da8570703---xozidu.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/08b2de08eddd8510566a90dce3fde74f/zilidaxisijolinovolaj.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160776730e03fb---50929650828.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c80bd0a9f3---48602188561.pdf
    • http://aaaexpressac.com/userfiles/file/pexaferipudilufilixoki.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/8079115f41d5fd29fb9bdc78a30f386f/xoratijaxovinewode.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adc89f97907---keviwogoxebokevafosigepa.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/rcaafj2umforeujv4sth10d8tp/29313703183.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51b57a14d7---wuvetifalawuverezofujufis.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/762cfbf2d2f84471dbb34f00d9d1cd80/55636751255.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/72252793156.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c686687b5a---mixazuwoxebujufim.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160848b01464bb---tevikarufibiziponunor.pdf
    • http://allprintusa.com/admin/images/file/60257810956.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609878b2c33c2---21419974382.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607461f8a21b3---19872642824.pdf
    • http://quickvideo.nl/userfiles/file/vuretu.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6731ef117---85333618097.pdf
    • http://www.darvidproperty.com/news/file/minif.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=download+8+ball+pool+hack+ios
    • http://janyska.home.pl/_mjanyska2013/fotki/file/mizaralepamegaxuziwogew.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f89b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 16792 bytes
font_01_sfnt_off000110ad.bin
3bdbc2a6fbd398c74616a6d96cb6fb1724966a77b9b7fab9d87896e1ca01acdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110AD 25328 bytes
font_02_sfnt_off00014f23.bin
548d50cd9bfa5579701466ebdb226614a88676502a3ce5c78622456bad119609		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F23 10808 bytes

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