Malicious PDF — malware analysis report

Static analysis result for SHA-256 842588728b855f9d…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 16:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 784f0e62ac807717ce216e605ff01cbb SHA-1: 982a4c7a37b1ed78677e137b7cff3619e439a144 SHA-256: 842588728b855f9d209509afa5b959318a001acfa181ab57a975a1e255bfba7f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of external links strongly suggest it is used as a lure to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://catamma.ru/uplcv?utm_term=barbie+mariposa+and+her+butterfly+fairy+friends+123movies PDF link annotation
    • https://pacpartner.net/images_client/imagesfile/85999723409.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109100616063873.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/42834295110.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/goserasomizizifuban.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/pemigegidafilum.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/muvog.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/potawukavap.pdfIn PDF document text
    • http://signauction.net/userfiles/file/293147229.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/91819299138.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/xofupokipagedizinofe.pdfIn PDF document text
    • http://tercovci.cz/files/file/53203274230.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/89361594622.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeab4e2002---papezatatujamafefa.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/64035567259.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c27c863b8---mizutuninusipiriwitiv.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/roverijisibalididugu.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/26526935572.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/2785352125.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/vemozasirifali.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/95353732063.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/tanadatin.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/fewomigafonipilofo.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/1071761016.pdfIn PDF document text
    • http://venkateshservices.com/uploads/46929293806.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d2cd15c53---69151349191.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/60582705701.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/11519932097.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/wumuwewuxodavuwidezezone.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_off0000d11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11B 11580 bytes
SHA-256: e1e053e7268800750f90e953d35a39aa129f532d215405b9b08629b0e95211b4
font_01_sfnt_off0000ec56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10468 21428 bytes
SHA-256: fa973d8824cdedceeb67509ad404e967df1236400ddbfb34301195b3105957eb

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