Malicious PDF — malware analysis report

Static analysis result for SHA-256 55386d9f948fa5a3…

MALICIOUS

PDF

86.1 KB Created: 2021-08-10 19:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1018cabd40ebf229d53d4da2d167f98b SHA-1: c2afdddf20a5233ef9c231d534e992ccf1b16be3 SHA-256: 55386d9f948fa5a3e76f61478d575192378bd2ac4b5b6632e5f6cc727b533be4
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and using IP literals, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links and disposable hosting further supports this. No scripts were extracted, so the primary attack vector appears to be social engineering via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.ih-consultant.com/ckfinder/userfiles/files/xeworoguzuv.pdf In PDF document text
    • http://nicenpos.com/userData/board/file/77715770950.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/de618c347446b81cdbcc39d4f410467f/62935214842.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/26699932914.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160be34ad6e5ec---86080785813.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/kewivotetiw.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/83155695604.pdfIn PDF document text
    • http://dakmet.pl/upload/zavarixifopuxujunot.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ed47818afd90cf8060e1644e462810b7/matafabumufugemag.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/53708536934.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/zezot.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c296fc0d785---20030087576.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/efbc05e0175c401693769e6ab90729f9/xiburulodujegileforad.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/30723749002.pdfIn PDF document text
    • http://cy2hand.com/userfiles/wogozupagid.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607340c5cbd87---92564197452.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/8qlgcfb2cnr9eakv6ur92i06iq/zafitonidogagazulesodog.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/a66e0d419e9d879456f930397fd6ccdf/gurapigexu.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/zobupex.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdee360d2b---zopakiwij.pdfPDF link annotation
    • http://atthaya.com/file_media/file_image/file/57222488883.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b7f7926e0---xudefaxedola.pdfIn PDF document text
    • https://isleo.com/i_photos/file/nigezomam.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b261b66969b---judamuvefaxozusowaw.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cabd65c4ce0---95453567068.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/37463986773.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a5ac8025a---88205352384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=fashion+nova+discount+code+50PDF 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_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 17384 bytes
SHA-256: 97031ca14e239e8e70a2cd3cd913f99c2464af387a6f802556a8252fed5bc3ae
font_01_sfnt_off000119d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D6 10720 bytes
SHA-256: 5fc9346f28853ec8640b71d97caef6f583fec526666e90640ccfee29795cd9fc
font_02_sfnt_off0001327a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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