Malicious PDF — malware analysis report

Static analysis result for SHA-256 84cef8996939bd25…

MALICIOUS

PDF

86.2 KB Created: 2021-09-05 19:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d25094dbdbe82384f659a1a6ef96810 SHA-1: ee232a578df5539c89bb0d7df883099304868046 SHA-256: 84cef8996939bd254fec0a9c5de2a68a3cf55230cb2c3d67d6dff4113e1c98b5
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external content, many hosted on compromised WordPress sites. This suggests the document is designed to lure users to malicious sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16076df2804ac9---gevimavob.pdf In PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609734a947522---64362814079.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/25623735861.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/wefesif.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/70726213811.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/59861393226.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/92648202199.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/278161443.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/89kdf33b4t8tdar9855d9e5ec4/16266167297.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/876660eccae69a2d675f4e8b6694677f/pamolikogefuf.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/56934485645.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/tagotekipodexamujadok.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/lewafutugus.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/jmhps9t7u1rnamrvk2ru6vgqv0/93703905314.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/74391151133.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/87176170719.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/35352250225.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/4330d6b3fcfc2298ca9e82e660998088/siwekafozodifogoto.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/zibexesipudalise.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/ef167a1941079bd9ac6e6a8af0de5e45/80547825822.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d695ad6d4cb---vazalowiluwopiredanoro.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/xuradularetu.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/phd3brv5t1o5sco4i59c2ef5o7/tenawek.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/nexezajizuwozisetora.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/rofek.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/k4gjs71mbtmo53i4qug5gec983/11658264187.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/76487535808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=protocol+i+geneva+convention+pdfPDF 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_off0000e9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CE 18672 bytes
SHA-256: 843435c897bc2087d3894a3b946be4eee30390b4263473162945a41f523222a7
font_01_sfnt_off00011a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001324c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324C 10692 bytes
SHA-256: f7393d6cde798182cb4cbe267c27bdd426f8f111e90cac7d09fdfa7dfcaa38b3