Malicious PDF — malware analysis report

Static analysis result for SHA-256 87abed10636533d5…

MALICIOUS

PDF

102.9 KB Created: 2021-07-04 13:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4cd1d96c58affc98715cd88a1641757 SHA-1: d15ebebc8ddbf2de21f21beafd7b9ca9ef6bd3c8 SHA-256: 87abed10636533d593413e663d4451c54d8f47a5e84afee0d7614743e8e763e4
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs and link farms suggests the primary goal is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/m0i18j3poi9jr9is9at3uai44t/4308007247.pdf In PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a6fe03797d61a92f442ad0a717bb89e2/88964330064.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/68a82e5209d7f14c4307910abe2aa39e/rarulirojozaladixe.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077341a71911---72401471726.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/buzesodabinofowivaneroxu.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/68752830513.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/6834382533.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/57aa318e670ac721ce6754b3646ec698/zugagiwalit.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/59423967390.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/96459790058.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/lolajolakelagajipiki.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/93462569249.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd609c755f---gelajiverunupepatiga.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/75709972658.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210602_105447.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/dapitazogipuzonejaf.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/ripiv.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/tneuga55i1brj8ips7e9pakpbd/gasoluxoni.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/0966693041cf088bc24cdc295926fa7d/mazawalumilifofupelo.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9d466f3f9---gaxarolotamoxuvafuvobusu.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/72621498686.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/29041192510.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ac1b77e81---48055002441.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/punewoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+the+square+of+30PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001443a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1443A 10696 bytes
SHA-256: 4f65fecc7b2e179d932f02873a6cd3fb4d17f67931a0ec6e341b689215b3e955
font_02_sfnt_off00015cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CFC 18284 bytes
SHA-256: 7f9003aa8a70c6f55b735d5d55dcc7900604ef0e9db80f1b1d0f602ca28b9dfe

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