Malicious PDF — malware analysis report

Static analysis result for SHA-256 daedfa950967c21c…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 11:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4dcccdc54b41081b301e03449297f61 SHA-1: 7fed0a1094e3305cfb04baf126a30589d616e6f4 SHA-256: daedfa950967c21c98c1695899de519c7e5f417adef008e1d4ec48051a70bebb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a likely phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were directly extracted, the structure and heuristic firings point towards a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210916054653.pdf In PDF document text
    • http://satisfytech.com/ck/upload/files/43552770691.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/7637787686.pdfIn PDF document text
    • https://franchisevisions.com/broker-site/files/files/22225536162.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/taxivoz.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/guwikedotupigixajidaxezar.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/napusoxalolaboruseked.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/pepupeze.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bb26d1500---putofev.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7a8f7a41a---25468672326.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/k98q2qaish3td6ghmjqit5kk1r/fetibipajaja.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bbff09aad---wunesaxupenizovurug.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/kupilakuwivajane.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/49085666904.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/79825190098.pdfIn PDF document text
    • http://synphabase.ch/upload/file/99900214802.pdfIn PDF document text
    • http://japhina.com/upload/file/lejokuwo.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/21895007906.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/joveguziraniv.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/kuxomopa.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16150eea0d235c---63689112343.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/vosawosagiwanoras.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/walowugabalapon.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/31818804824.pdfIn PDF document text
    • http://kustari.net/userfiles/file/gitapojomi.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/2f060c28d7fab55607aaa03a9a881acd/dulitimunufoxafovopijokex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=aliens+drive+me+crazy+hack+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_off0000b279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB279 15100 bytes
SHA-256: 97b7222546a1699ccbeac9e5bd7a31380fc9f572dabc15e35854c2a33cdccc4e
font_01_sfnt_off0000d8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C4 10872 bytes
SHA-256: d20fafda205f8bdfe4d9aa995e8418f0631f96fe7da9c20335a06489ef175c0f
font_02_sfnt_off0000f1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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