Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a060271fb7995fc…

MALICIOUS

PDF

85.4 KB Created: 2021-08-07 18:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33e944b66f2a67597f15eb527af27ec8 SHA-1: 960461b0b96794a4778589a3bf7baadcc7b8ba00 SHA-256: 4a060271fb7995fc4f95c141026e2e691ce449f1d94e1a3e369e3372726abc68
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=exemple+proc%C3%A8s+verbal+assembl%C3%A9e+g%C3%A9n%C3%A9rale+constitutive+association PDF link annotation
    • https://keralatemples.info/ckfinder/userfiles/files/7581578608.pdfIn PDF document text
    • http://cjatkinson.com/userimages/64703603715.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/lebimab.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/62d779fcc050360b972f73132bc8a849/26306943961.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160966f491bbbd---99698339803.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/97771292008.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/7112863987.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed6ef5282f---piwikepelusimokinosejor.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d24077a7f2---nijidelot.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160753b59db02a---66017864492.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/kanotomodizuniba.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/fcca0d5e49b4b4f278c73e5b5505ff8d/40060041828.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/tebuvonutunaga.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/a615a0f1ea0826519572c1d023bdde9a/nidax.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/99342919085.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/97941718344.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608109d12c1d5---jofaser.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/df83149c1363f96b360479cdce161d9b/fojamafimewapinubomoxuf.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d230c778b99---89982205619.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/20552121903.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/63619173951.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/90604969147.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/auni0guqh64hqttng021hg4i20/vebibonedoragumapefu.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_off0000e860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 11420 bytes
SHA-256: a52b751a2a8e2e7e85f4383b727750a17ca2d728be22d58628ae590549fa6147
font_02_sfnt_off00011a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A87 16916 bytes
SHA-256: bed570a8edca92d0af1e9b7aa60965048631f3823c049fe4d016b7c4446b9367