Malicious PDF — malware analysis report

Static analysis result for SHA-256 be522b095484e79d…

MALICIOUS

PDF

138.3 KB Created: 2021-07-09 12:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b0e25be098e364fd6e5736124df05a1 SHA-1: afa416ec78bf86e06a6d2d29b7eee510ccd3e82c SHA-256: be522b095484e79d0f93614fb988eadf47f483f3474aceef7175ac8a2c4107f0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, indicating a likely attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the link farm structure suggests it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9228

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://vresponse.net/userfiles/file/64797537653.pdf
    • http://augustaelectricalwork.com/editorData/file/25214968581.pdf
    • http://sarljarry.fr/userfiles/file/ralamomedapefawijiwolovav.pdf
    • http://salinasouth.com/clients/11073/File/89173466454.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bad42ac0835---42371839753.pdf
    • http://manhchenang.vn/webroot/img/files/84830113082.pdf
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/kudivuw.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/puqsuvakoi6l7oh54qbrfqp0i0/mojiwizatigixufe.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/7ff5c55c9569fa50287015dfa15b983d/vidoxugu.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ee8c7bfae---fegaf.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1ac6ef74f---79019004119.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16078416c26d3d---fabataxajurob.pdf
    • https://www.alapan.org/fckimages/file/tikevit.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//dawaxifujere.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/233d5efa99b0a70387f9e465b74a55c1/zepixisimoxiguzulofub.pdf
    • http://grawerlik.pl/userfiles/file/fupanoboboxuxefujorire.pdf
    • http://prinsart.ro/uploads/files/tonunerizusowora.pdf
    • https://immobilgold.com/file/lival.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc4832ec5f---bokamudivofazusuwezude.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608934afbcf55---tovanetogawabewelefix.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/sm4pc816b1dnpcupipit9fu78s/10437869522.pdf
    • http://birnagarcollege.in/userfiles/file/nufuzubopad.pdf
    • http://planbmedia.hu/files/2457836095.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3f2255bad---jirixor.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087236471037---86177228330.pdf
    • http://lawrence-spruill.com/clients/42275/File/womalodedotowezisaxisimet.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=taylor+swift+commercial
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ac3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC3B 16792 bytes
font_01_sfnt_off0001c44d.bin
6bc3032520475070effdb06d089acab2b6ca95300dab732b93f585b3711d094f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C44D 20232 bytes
font_02_sfnt_off0001f93b.bin
883aaa06afe499ff6cd0e42d6d7fb851b180f6c27303edc9d1f0b6c55c265949
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F93B 10556 bytes
font_03_sfnt_off00021177.bin
d03db559901a3ecff2bbd1a29d1ed226e24ce3a283915f7823ab8873681e7b6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x21177 1676 bytes