Malicious PDF — malware analysis report

Static analysis result for SHA-256 0952a803719d3032…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 01:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3e671eb2d430f829777efbace69ac4ff SHA-1: ed10c16926a54b00814722359b8bb4a1aacafc29 SHA-256: 0952a803719d303271d386c740b1cd52bff3ad468cdf26634c1497e0c00a2bdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of these links strongly suggest it is used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://coretry.ru/uplcv?utm_term=sugarcane+wooly+aphid PDF link annotation
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/432b9634c0e283f202b2a59121efac6b/dozof.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rufodofijokof.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/a88cd95f11b53eec0f44f14abab1ff12/6801020139.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ko19ud3it0ms0aetsnce8ubd0/bupofilinuzupobi.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/16948144518.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16119f5554c55f---98669940786.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1ced90e4e---ruwenekibevuna.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/ebf5b40071913dd5f556f4805d5fb672/2152826801.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/lobiboluberujodatesepikif.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb13758a0c---leladibul.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fdf5158f2---46447778888.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/tibisuferaporisemitoror.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/mapowe.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/legoxizezafarodagimefi.pdfIn PDF document text
    • http://falerisztika.hu/tmp/tadusuxaregovesinufov.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/76af87ebda2ae1f11c560c4a2c2135f8/41105976541.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/ecb7381129cca4330523787e90f7a0b3/18747878556.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/117da9679cf0a60eee5cdc59bd3b928b/77706093457.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/3788f04b4999006e33c067dbc7fb94f2/jobemubolame.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/fuhvg589cuidgi15suh4k472nd/xokipozuropapaxuv.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/wopurom.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fb5ee542ba5---duredatowifesodegelav.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5107ee286---61209560211.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc1f227a9ac---kusixeziratexifozek.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/67933535187.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/nutaleloxerufazib.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_off0000e870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 10904 bytes
SHA-256: 9ba1dae48a220a7325c2a722338bc34fce7b2140fc649b1ef0add45b6d44e285
font_01_sfnt_off0001016c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016C 17564 bytes
SHA-256: 83bef001c5646d5ef609ebcf2370ea14a1b55250f1aa2f91867ce05ae3286714
font_02_sfnt_off00012f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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