Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ae677b3b793492…

MALICIOUS

PDF

105.7 KB Created: 2021-07-08 12:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d71d482efeffdd9401c8839e82b8ccfe SHA-1: 6d67581e6c1875ab31ac0b098017eb0e7e996d81 SHA-256: 18ae677b3b79349281a39f3240702d5d99723133ceab2ee7f320796c2cc35b6d
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into downloading further malware or engaging in phishing activities. The presence of a 'download button' heuristic further supports this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4918699e6---jinudax.pdf In PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/544d6b6a75e05da7ae87cc769228213d/pobejofub.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/18620435482.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/7931928591.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/cf17fb70f6b06030f787fe32a01b16ef/74004211929.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4555025a5cbc3d1c89fe2d798fd00bc9/48220618779.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/82802151948.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/69519274026.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/sezulojonimubafokid.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/xarutavepezakik.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/b175d84ad1d1ee262255ebddcb26d9fa/sarisikip.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4796d8aad---zakamajokinizafoludel.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8a33a55e0---48358006374.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607908ece53f6---netekifovimalirikekirizuk.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/susemozabevovutezotisuxaj.pdfIn PDF document text
    • https://aneri12.cz/res/file/11299172613.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kidixadasenibokareruwitu.pdfIn PDF document text
    • https://elektrona.cz/files/file/30215069321.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/72315d9hsbkqmgk8s7b9k3q06r/48243036197.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/82195201443.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/59638910909.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/18902108239.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160de7cddda480---14577406977.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ab392cbed5a---90943877541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=free+video+volume+booster+for+windows+10PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE434 17684 bytes
SHA-256: bd83df932a64850c9ca7a3b14e3a32781efbd90e10307b2c17a81458d35b98d6
font_01_sfnt_off00011218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2F 10896 bytes
SHA-256: 0f5e07af1165c32a733a38d6b6ed46bb27127c83e08f3572b70c6d6c2dc87d08
font_03_sfnt_off0001436a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1436A 29384 bytes
SHA-256: 1544d913e86423d030f0dd6b33ce909696f1c1262257de66b5ae72516be1d79a

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