Malicious PDF — malware analysis report

Static analysis result for SHA-256 e347cfecc4e9cb38…

MALICIOUS

PDF

77.2 KB Created: 2021-09-06 02:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 60fc0c9327ea8cabe915485a1a8f7e31 SHA-1: bcbd71820eb85917b5d28729f85854c9590210e7 SHA-256: e347cfecc4e9cb389f6a1a58f36581f0bbc423e89e218f0890e5927796a85fd2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=b+and+v+pronunciation+worksheets PDF link annotation
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077516280aa2---mebetilijejutivira.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/gobarenadazofiworapi.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/tonopixomazewotob.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1612bd970c778d---16543210710.pdfIn PDF document text
    • https://paradigma.bg/uf/file/lamaluwolemesafejuzuluv.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/26344440300.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/kalusuli.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/10314225746.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e40dd514b---tabesumaxikixatujom.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/b888f3d763646998633ab5249f62ffb4/walizis.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/s93so321b6dn582rvgb3jq59r1/7832958135.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/duniku.pdfIn PDF document text
    • https://faceless.me/userfiles/files/suvanadakokotezutenogud.pdfIn PDF document text
    • https://tl-systems.hu/files/files/xewadobotuwekutew.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/botijavufidoti.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/85092630667.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16076953712502---pofizidulo.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f297b81902---wulepudumepo.pdfIn PDF document text
    • https://smaransaving.com.np/ckfinder/userfiles/files/12652976774.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7156761ac---gafoxede.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a1ead4add---72010713068.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e788bb5d8f---fetipegez.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/730aec9928d99a07f722ab33ecf805a4/58869749740.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/qvnfmakoh1gjc0sk882amt32j1/90706208981.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC9 10960 bytes
SHA-256: 4e6cbe189ee29f3f078a1e481d2152c278adfa16b4bfd46aca81cd47312784bd
font_02_sfnt_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 18460 bytes
SHA-256: 018145601dfa626fd755bb20701946a7fee5d6105db8e5db23acf745b88831d5

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