Malicious PDF — malware analysis report

Static analysis result for SHA-256 316efd92ec89a3da…

MALICIOUS

PDF

96.5 KB Created: 2021-09-13 06:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af454d48208906b8d4269fdc0e595738 SHA-1: 3192e227e9a8d1fdc034188024b485d3eddd5411 SHA-256: 316efd92ec89a3da5f2366518527fd549ac80ad69cb3d429abf07c708384cd75
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely to redirect users to malicious content. The presence of multiple compromised CMS upload links suggests a coordinated effort to host and distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://dautuck.com/uploads/userfiles/file/viriguminipiw.pdf In PDF document text
    • http://studiocinti.eu/userfiles/files/2406904410.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7fb667c49---82139278920.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b14d0ebb7dbb8750f52badb74422e99b/50372010515.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161326525cc3ce---14709663691.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/1932076482.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/92409733751.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/22660082951.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/9760785677.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/22216104547.pdfIn PDF document text
    • http://dasbluemchen.com/suvigalesinekixawa.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/tapek.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/72923786751.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/zexawaxanatujopusesunesu.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/55286337779.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/56798262504.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/94630156812.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372d59690bb---37028871987.pdfIn PDF document text
    • https://papiratisk.cz/soubory/36805092347.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/dofijag.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/supol.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/85238438260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=splendid+logo+maker+pro+apk+free+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E7 1732 bytes
SHA-256: cc9aa9d10d6f336345dda96c648cf1cebe6fdaa1cf59576acfec5bb48f04b3bd
font_01_sfnt_off0000e11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 10828 bytes
SHA-256: be4ed2238cf4b74d01b5183e4d911a34edc56be817287f687efa137dfa2541a4
font_02_sfnt_off0000f9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DF 16728 bytes
SHA-256: 1c3417a1cd14c84d26d024aa2bd50f062e64e7f7618cf7fbc9504dc956119c4a
font_03_sfnt_off000111c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000129d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D4 28800 bytes
SHA-256: b731df3ac6b4a2290acaa687a8a73b28205b00f119d0484624a28f8a824637b4