Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e9c2f7c5a94246…

MALICIOUS

PDF

94.2 KB Created: 2021-07-15 23:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 756dd7199ca55365d89ce70f86175730 SHA-1: 58545521e7bb810e7b75f787fc62adfba7217fc3 SHA-256: b4e9c2f7c5a94246a755ed3f3e5fd4e6ba2cbaf4746dba3ca920b3006fe67e58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs hosted on compromised or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the nature of these links, suggesting an attempt to distribute malicious content or phish for credentials. No scripts were extracted, but the primary attack vector appears to be user interaction with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://infrive.ru/uplcv?utm_term=expedite+the+process+meaning PDF link annotation
    • http://izumrud38.com/ckfinder/userfiles/files/lozekiwatigejimunige.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/23058626970.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/2f2423135058f85ccd07b0b0095f588e/56752308630.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/qdcj0es2d2sbfg7glt4q13kvnh/47093284821.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/gukasitamevaxewo.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/73993978714.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/suwozumovibedudetadaxax.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/98425756928.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c0dc75520007a5e92708ba3656a0d29d/13964997916.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/22396426287.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/34263990612.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/piradeb.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/doojgprd730ikqacesgkhdalle/84579275903.pdfIn PDF document text
    • http://capri.lt/userfiles/files/xaxafufezilaluniteragad.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/6055352300.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/leruromujoz.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/717bac5f023ffef7a941ab5691b27094/32774181200.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/82150193347.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7f5089010---93382967218.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cadb9dc45efa4132927eb7fe08867e35/54629260110.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160764175caaa8---3023893259.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/vusivotilosuwifud.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9649b29f03---vebozekew.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/5071236783.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///lidedafesimuwelulazovokuf.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 11000 bytes
SHA-256: a725fa7b090d7bf492569ff08f3e3442c5781bfad8194b2935fcd278ab90a0ef
font_01_sfnt_off0000ffcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DD 16932 bytes
SHA-256: 1d62bee80e13f34a62f51fdabbac6463291e893b31e912ffdec73dad9801fe12
font_03_sfnt_off00013081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13081 1728 bytes
SHA-256: 57eddfd20a5532195ef8c259040b6dab99543ee885f86974fd3d8428f697fd68
font_04_sfnt_off000138a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A0 19004 bytes
SHA-256: 56241c272295d2d7843c8f054f9c4910115ac3fc115614268d5c6fe02a21852c

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