Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee2ff42ae1585952…

MALICIOUS

PDF

103.4 KB Created: 2021-07-06 06:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8a3fdc2d3f8b584ddf335e3da3475cc1 SHA-1: 63fc37b1f0b18524aed7bf900af21b0e0c374d6e SHA-256: ee2ff42ae1585952e8b68dbc929657d259e3bb14afdbfff2b3f041cfda92a1f8
96 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting. The ML classifier also flagged this PDF as malicious with high confidence. The presence of numerous links suggests an attempt to direct users to potentially malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

Heuristics 5

  • 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://crysiq.ru/uplcv?utm_term=raising+meaning+in+tamil PDF link annotation
    • http://sanruou.com/app/webroot/uploads/files/72081795651.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/a31a4c1cd08ea3757bf2f688ab976fe6/50469650295.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f77d5c6038---88726142026.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ht9ugedqm5kkv7dhl9t2mea35u/42700296306.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/towubixotobugexosuxutox.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071f596b7346---kunopunafomawed.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b11334089374322aa134b90b01b23ed7/89341754442.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/44e588b937ed86d12baced897df2cc00/bivozafexusujexutus.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f4686a91ef503ca89f5342f4e1c4ba43/59852043936.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e5da6afcc---xesikijo.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/6f71120d9bf0659091d20f0d88603deb/39729059132.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/vojepemonabotinogopase.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d3da1e0e0---gisiruwaniludisebadam.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/u7fvmhbaq1d0orfe9d3e82m378/kinur.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/88196acc5173a56ba97e8a5207e09bf1/5335157572.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/sufagogirare.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a482eb6a270---foxomajixoz.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/pegoxoruwolevuvenatotaso.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/jorunazupunu.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072e5f5705c1---66641801338.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/ef172c6912f48edc2e784b09d6d5cf35/2308887147.pdfIn PDF document text
    • https://europartner2.pl/uploads/83537692254.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788c8cbffef---31805334828.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/588sabugbshjnv9nj8mdbh7610/tavawidagotopofeziz.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
stream_005_off000161cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x161CC 19184 bytes
SHA-256: 318d057b7495cc146250b815f4dd1f485a092e3f45410c91b26f6428ca0ff841
font_00_sfnt_off0000f82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11041 10276 bytes
SHA-256: 5935353d598227ac97044dd29fda7bed1f0fcfa117438f527382fb9354dc01ef
font_02_sfnt_off0001274e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274E 23976 bytes
SHA-256: 0dd1401d65c29db2aff973cfee07784c9d3ad695b58b3a1222a975a41dc82d65
font_04_sfnt_off00018203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18203 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff

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