Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c3d7a7c255b071…

MALICIOUS

PDF

125.8 KB Created: 2021-07-15 15:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f7ebda39f40fce9f001db18c65b046d1 SHA-1: c8c9f7eab69ab415fee0ea649345df2482627435 SHA-256: 94c3d7a7c255b071fb6c7c852c2ddfe420b706db3272a8811ded70b26d719a63
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting it functions as a link farm to lure users to malicious sites. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://abwrosedale.com/uploads/files/jomulesunuzikufisuwit.pdf In PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f466471416---tijijujudepi.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/b52afbp1bv4ephsp4m71ff0ab6/boresugibajapimememedu.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210616_371F8E4251AD1836.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/8ff5a2301743265a69a039bdc299333d/68479455243.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/mifasokexigajaral.pdfIn PDF document text
    • https://akvaguru.hu/user/file/45099123596.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/51070973785.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/gusaxawuzen.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/70982794f2c6e2fe7f2cb86bc4489a8f/54698970721.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/33956686786.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/7df0bfa663ad5dff88afb6f4dc317781/gagoxiwulodi.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/mitalugorigam.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/lsl71klmdemqgqnb5rf7pg43gn/19773813927.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/xuvevikelakejowux.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae83558dd---54848832290.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/851e14812971ab44d74e955e390f7fbf/xepeloxemunezi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7da58d5l3r9u89ih1cqft5d0j7/46541237163.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/6dab805e3526f1b5188b30459cadcccc/penajupedugomujufigem.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/01hg3vitqn12i6stoksp2egcmg/32821280596.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c789112aaba2fded0d6a60e2a78554a2/vuwoka.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/6qihrchcoploivk31rr2ojkltj/16832371861.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ea824d1ec---20810688475.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073f43feb516---banobegebevekoruboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+does+12+et+meanPDF 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_off00018b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B68 18004 bytes
SHA-256: 00674bafd617e5017015cb8e1fdfea5c7b5924e0c2809b113e02df225757d9cd
font_01_sfnt_off0001ba82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA82 10440 bytes
SHA-256: c3632471a7c5a2af15f082eb77ab9c01a75a4cad93dcc7b2db2cbd73ac5b769a
font_02_sfnt_off0001d227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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