Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd65dd79dd0205d…

MALICIOUS

PDF

67.8 KB Created: 2021-09-08 22:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 96bd2189bf5e7889768b5ea08bed5cda SHA-1: f808151deb8e546c636b8cf62673d91333e8204e SHA-256: 4fd65dd79dd0205df8401791de43fce6beb34321e4aeccd7980f46890941ab15
176 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Multiple heuristics indicate it's a link farm pointing to compromised WordPress sites, likely serving as a distribution point for malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b759818fe---89639152011.pdf In PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343d4660500---67044252117.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210904053406.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/20440124545.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/12462269262.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/lalisotosoju.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/52116826057.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/fadalabosasigovux.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/51800364164.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/wexos.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c1f483793---fadumifimamifidajolixigef.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/84038297259.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/22233354483.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161344680b7e81---foketulexekubelozepaj.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210902152818_fot5jd.pdfIn PDF document text
    • https://maria-galland.ru/files/file/fuwiwunuvorenozixiriware.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/58369587823.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/bigokudajakoxuwonij.pdfIn PDF document text
    • http://jawarakreasi.com/file/wapiwasan.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/fururiposabixu.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/lixoxat.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/xodugijedevuwemetepoxakoj.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb97f267b---sizume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ad%26d+1st+edition+player%27s+handbook+pdfPDF 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_off0000b3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBC 14184 bytes
SHA-256: 4aafcdca832a606fd6439db6d436b99980686fc31d6f5be7870856646bec57eb
font_02_sfnt_off0000eed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 9192 bytes
SHA-256: cec472d94eb3fdb0df358ebc6477a54accfbb063ec4a1f62a798cb8c4131dde5

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