Malicious PDF — malware analysis report

Static analysis result for SHA-256 440e3d51ab9ec2d0…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 00:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 40528b9f75279d4483dc65ca4a86ec27 SHA-1: 75c3af228c8b11d460da24af1f1fe08a76c16bad SHA-256: 440e3d51ab9ec2d04412b3b6d075aeece41ac537fbaf1fc71d97615df5cd8281
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and link farms, many hosted on disposable or compromised domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=fnaf+sister+location+download+pc+free PDF link annotation
    • https://812423.qqtogeljackpot2.com/contents/files/48552332613.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/97543992159.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140432078cbd---21483376461.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/xupexelotijamepokulizefo.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140c399927dd---52231788815.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e4fdc9442---21350475418.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/jazerimipuzari.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/9075847372.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/laguvoj.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210910_8825762CEC67ECC3.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109102155105845.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/48196672642.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/bedaveneziv.pdfIn PDF document text
    • https://partetesal.ir/data/file/29803744723.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/pitafunodoribepafozogolat.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/puwavojip.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/fudiwasumifiziguzexinu.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/sepasawepitil.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/23690032274.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8fe60d547ee2803744048f4e38730359/44238398683.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/95972125690.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/nirebafizifenavesegadek.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e9f5a01b940723e4e56263fdcf50dcbe/36809227531.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B5 10676 bytes
SHA-256: 1ba08ec7f8d7bd20422c0e8d99d23add3c5004e1bb62ba327204e97b80d89980
font_01_sfnt_off0000ef58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 17152 bytes
SHA-256: b891574f7dc9236405a965b9d84d5480495cccc34324e55d129127faece79ab4
font_02_sfnt_off00011bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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