Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d839c317dee392…

MALICIOUS

PDF

89.8 KB Created: 2021-08-25 01:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb0f7784df86d01977b1c7ae59e1f71f SHA-1: e7b36d33d58af4369b7494905ec92b53d311dc38 SHA-256: 53d839c317dee392b2ab51656f28bceacd67061a5f6fc1b3df89a134ee6ff5c7
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of multiple links on disposable hosting and the use of compromised CMS uploads further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/a3djj6jesu80uql6tjv1ouejh4/newetalu.pdf
    • https://iword.de/userfiles/file/48527215721.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608428d434777---fofulaxen.pdf
    • http://artkulinaria.pl/sites/default/files/file/73632519708.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ko5g1ojgv1qfpfu951365eiq9/sopawevukon.pdf
    • http://lurome7071.com/clients/e/ec/ec9741bbacd2a64db66b94b03f3cd24d/File/gogudu.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e69990f48a---75642739344.pdf
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/8363bf4316eec383cc059ecad811e4f3/17155859683.pdf
    • http://polymer-optix.de/userfiles/file/xebaloninonozenetazimew.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/313ce295cc7c26f3b00935efc440f636/67741098509.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/fodofewularetebuzon.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f46d44946d---67968928705.pdf
    • http://www.mediagrand.hu/data/editorfile/dijitexa.pdf
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210612063539.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4c821c818---45437015478.pdf
    • http://duonglaohanoi.com/userfiles/file/86758226252.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/b46ii59ereocumo9okeg0o0b7e/zuzojobonewo.pdf
    • http://vigova.com/Images_upload/files/megezetumujezedunixibomi.pdf
    • https://1877painters.com/FCKeditor/file/niritababipusot.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/mopum.pdf
    • https://triptoboloyfoundation.org/editorsfiles/files/83846178114.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/ea81e6b1a52f8cdfef6a90c8d4006640/duvazabubasan.pdf
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/jukiwiserakidenefurux.pdf
    • http://richardchong.com/userfiles/files/52975414308.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=younique+rose+water+benefits
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2b8.bin
2386749bc0408ad6d409c9705cbc8af03177e3865ff851bef01ce92e0fb04d04
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 10616 bytes
font_01_sfnt_off0000fb33.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB33 16312 bytes
font_02_sfnt_off0001113a.bin
8d41f717bbde639e1d3469d281b57e8646360be335ff472d35f6bb04af9d60b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1113A 17764 bytes
font_03_sfnt_off00014007.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14007 16792 bytes