Malicious PDF — malware analysis report

Static analysis result for SHA-256 404bc4f2283f7bbf…

MALICIOUS

PDF

113.1 KB Created: 2021-06-30 04:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c9cb2ab267890979eafc26e21e154792 SHA-1: eb6e3f62fb5f42f9633bf5ccd15e8be76a1fd725 SHA-256: 404bc4f2283f7bbf3580cbb2ed05c47f15859303069f841328c4e092ea8d58b2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9718

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://absolutelyneon.com/userfiles/file/48819961360.pdf In PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4435b9c3e---37612048440.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/5122853657.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608800468a1c5---sevijop.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/987b8ac694aa7ca73711d7b577d68ea1/jawekilu.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/el9djkmn8t12o4dncogldk98d6/jetamomekutinawewil.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/fezafawanazog.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608828a4c1fe3---bufibexivirufasatifeso.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/fibizafipuluguseruwevun.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e36402a48---vazojuvuzolagosuvavivis.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/jhumtmqh1i3oaeso48p9lrs0pk/84162805502.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/pcp74ao8ogv48bdn0f6tktsv0d/ziwugakeworipiborozeruf.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-4/20210504112226490531.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/a36e62fdab0b441721a6c125de520d17/19810429840.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094571556945---xiwuvigowagikoxu.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/b6e93917e77e65bafd4c334857d160c3/mamerovumisapekoxosakan.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096c02d99c0b---ritixalilikeguguwezixosut.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/20f92d885f502b6214f87d59f21849b3/pisotivuxewufukunenekelo.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/powavupolewidixeroxipole.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16088b5e164c4f---vudemalunitedu.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/45537024928.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/12c8034cafaeacbef94363a1c5acbf5c/52113068598.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160738cc107991---12995502857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=9.4+practice+a+geometry+answersPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000139b4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x139B4 17804 bytes
SHA-256: 8879e5f8ed7b8865e706e6cc61e8efb1ac8405feb9c82c126742758eb989cc2c
font_00_sfnt_off000121a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001554e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1554E 17788 bytes
SHA-256: d165c9d41389536b847684b4f34a2d0a13b923f62cd7310ed9bde364c2477038
font_03_sfnt_off000183c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183C6 11084 bytes
SHA-256: 2b3b317fc7bbbc8f67166eacd48a76fc38d8a4a38a9b3f316a64dd1e755bdd4b
font_04_sfnt_off00019dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DBA 6908 bytes
SHA-256: 4332325bee68fc3394487be94491947360447965c4e5249a6088e2653e567260

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