Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc8623d9365dd1b…

MALICIOUS

PDF

94.8 KB Created: 2021-08-06 03:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f7b2dfded5d8a9a6612fc3dad80aba6 SHA-1: 1d8331d8826319e7f0f65a489c8166fca815024f SHA-256: 1cc8623d9365dd1b155eeae7d88af57c64ebba8540f680b08d813255dc5eccff
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and link farms on potentially compromised or disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://infrive.ru/uplcv?utm_term=poetry+rhyme+scheme+practice PDF link annotation
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/fa35453b99823cd9097b020fe932a2d9/53431279790.pdfIn PDF document text
    • http://beiks.info/public/file/58982030116.pdfIn PDF document text
    • http://texmet.pl/userimages/file/linovinub.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c3024a36---26550738003.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ab8ce172d---72768282043.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-7-17/20210717115848610742.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/kizavufisevoketilim.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad22d5f1bed---36244816037.pdfIn PDF document text
    • http://terminsk.by/pics/files/84112489786.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/nodirijowazezozuzumu.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-10/20210610215002223908.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/b07364ec12de6ece73535009bce2c068/63811434740.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0bb850382---xojobikabepofamir.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f6e2eec94494a2cb603625121f4512f0/zorip.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a15694bbe62---sojuz.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/d74a95c95e75f0cb8d2acd71d9d34de9/xoguwasugonizatimomoli.pdfIn PDF document text
    • https://plasy.com/uploads/file/fadigugavunowavo.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/keteg.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/27929453817.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714614898c8---wumon.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/59581648867.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/sm4pc816b1dnpcupipit9fu78s/10437869522.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/jidiruwututopobipon.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/zoweniteritetibivovokimot.pdfIn PDF document text
    • 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_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 17296 bytes
SHA-256: 3a458a82f2881d01e57b20cca4661c29d0ca150911b220fb1cec11bac91187b7
font_01_sfnt_off000126a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB9 10604 bytes
SHA-256: ce1450686e5b29899fda1535b63bd86a645df71462a2bd52eecb5b2775cdcffa
font_03_sfnt_off0001570d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1570D 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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