Malicious PDF — malware analysis report

Static analysis result for SHA-256 910061d89b590c7c…

MALICIOUS

PDF

88.7 KB Created: 2021-06-25 21:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 00f04146960ffa1e734494fdec96c2f0 SHA-1: 60a85a6703704cfba86cf011f00e75aa284687f4 SHA-256: 910061d89b590c7c84df9ad42aa4939c9eed7b75227f7686f71cbb58da2d9f71
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, 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 PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4221326e5---xodotezo.pdf In PDF document text
    • http://suacona.com/clients/16856/File/mefefowem.pdfIn PDF document text
    • http://indecomavo.pl/inc/80086032069.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/1e88cl4uqq7lj2dk1j78huod18/pemira.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/gtplb25af45bkpnqmcc8dlht1q/rakamibikijanewozopo.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/87344564848.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e28f3b2cb8c3a21142f35062d05c5992/20594096923.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/dakuzosujesudetipalejoniv.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/wituzuwabetolif.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/680dc127fb7031f6d87e354f352966ba/paxegubukejinekisijozupud.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/bae524550b3a08ed4aa1d26c85054d27/sinixevidab.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021521043291065.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/13489763341.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/27722482616.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608377f0d488e---koremawixo.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080353bac02c---12191638542.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609839b7a0e07---bipibikox.pdfIn PDF document text
    • http://artospace.com/pics/file/fawebamebebape.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/42844ba8b96e379bcb22ee4dd34e8b10/gutanosiw.pdfIn PDF document text
    • https://egf.tw/test2/images/file/38742508999.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/4b9082f470ae2da868992445c0b63a68/sarufubesatenev.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98864d753---3008080953.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gqhldtr8r1fij4632aps07l2u4/78120799452.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/nolijuviwo.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b290820f50a---89325586946.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a786e7344d---suviki.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf478493c3---65764044054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=santa+claus+is+comin+to+town+sheet+music+pianoPDF 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_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 16732 bytes
SHA-256: e41362675e7189ebe2a167c0a3860d0b862717acb0947bf8519c7a2fd901b42b
font_01_sfnt_off000124c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C1 10800 bytes
SHA-256: 4b03e62ac58b06b07ada0430a590a305694ca4dc3853122bbbf1f83b23d92c80
font_02_sfnt_off00013d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1