Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0fe0808e33e0404…

MALICIOUS

PDF

87.5 KB Created: 2021-09-02 09:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e47a7c4d248aa5887d0cbc0215f7ebae SHA-1: 0efcaa5d5c62291f3b2877af082d746b2741e1ca SHA-256: e0fe0808e33e0404c3cdbaa852df610224927bfd1ee0a769b2ed7533a4fb4184
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to lure users into clicking and potentially downloading further payloads or submitting sensitive information. The presence of multiple links on disposable hosting and the use of UTM parameters suggest a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160aff6d01d9f1---mazavifuxuwububovevake.pdf In PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/ba16e3e2adff1bcc47f59836a93b9f29/wolosuse.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1612c3d3f34dd3---41151641425.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe7e42d7923---rurepubolafakud.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/98183443590.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210802_023643.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/dekulovarad.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b9be1214d---50910851188.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/b918c6d300b9e97981a14afba3b6f160/5118702509.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/5380067284.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/vujegokabad.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d24e48457---29280969453.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/17e1fa27fc7411c47580bde1c92fb5f3/46533466334.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a71e17cf0fa---lapelimogebusupopokagul.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/reronufipojuwak.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/nifepojebevilagare.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160befde929f3c---69108795948.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7950848a39---fulukekobitutanata.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdedf354a81---davukit.pdfIn PDF document text
    • http://gaudi.tw/upload/file/xekevemalewafajis.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/96535696693.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/buviwanapasinalosufife.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080eccdbbad5---sanejugovegejipepow.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/5618ce6c4f76a3f6fbbf8cb29fba267a/xedadibexogumogejife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=should+you+go+to+hospital+if+water+breaksPDF 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_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 11280 bytes
SHA-256: 66bfd08d33dc7ed75fb952fe862a5a72465d2ff588ed99860352ef8958af294b
font_01_sfnt_off00010a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 17952 bytes
SHA-256: 47c8f25b7344ca057cdf1d31a784a3af3f5db02811312eedd6462b2d9889e576
font_02_sfnt_off00013805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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