Malicious PDF — malware analysis report

Static analysis result for SHA-256 af58c51642f7c919…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 05:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eabd5e512b7991665b5c74df32d44fc9 SHA-1: 489198ef45a33ab99ff44e025e9f46733d774013 SHA-256: af58c51642f7c91905fdf3203a16262ddd63fb7dd1f53f8bdc555ec021f93315
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URI heuristics and the compromised CMS upload link farm heuristic strongly suggest a malicious intent to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://scantech3d.com/files/15267834059.pdf In PDF document text
    • http://guitarenko.fr/img/files/xuwufedomitorupivupu.pdfIn PDF document text
    • http://brenderup.ro/mm/file/42967987342.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/vapufakeruxatebivutanoxu.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/11220554322.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/ruvinepatoxosibupujil.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/pulolusat.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/povujukatukabedizirukax.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/xaridafiberu.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/94593525625.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/kogexelopabijavovuxi.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/86486539490.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613e78ee28175---62920284407.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/mimisapujilezafoteteloko.pdfIn PDF document text
    • http://446888.top/userfiles/file/98753119025.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/38487041084.pdfIn PDF document text
    • https://rosycaffe.com/file/10575844809.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/dezedisegami.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e256e6ebab---zoxezemeridu.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/muwekajumax.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/juxeze.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/7ae5838762c5194c92ef1a40a73b45b2/50672711840.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/sosogirizejeguzuzajekowud.pdfIn PDF document text
    • http://grandfiltr.com/files/file/kikinogijaxedutikal.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/61132891530.pdfIn PDF document text
    • http://home-plast.ru/foto/files/6234494248.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/wijida.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/7ddbce82ba221ddb29b7f16b1d91bf59/50523483142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=mobile+studio+apkPDF 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_off0000d440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD440 17600 bytes
SHA-256: 67cc1c987965342419422ac2e82dcf3ab9a53b955581a4455b3d84977913f0bf
font_01_sfnt_off0001023d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 10504 bytes
SHA-256: 0ca1ef28cd19e7268db2dc5854be5502cc85f87d1ab293a0a1891702c0e6f8b1
font_02_sfnt_off00011a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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