Malicious PDF — malware analysis report

Static analysis result for SHA-256 9234460deb1b9977…

MALICIOUS

PDF

92.2 KB Created: 2021-09-06 12:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bce80345d40f0b0b5d975eabc79246da SHA-1: 1d4705f1ccb62597b29058551bb03686ed49c940 SHA-256: 9234460deb1b9977a1ce33447bcf53174be10f9ddce50b9ce5bb4e0b5ba0ba1d
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites and raw IP addresses, likely for phishing or malware distribution. The presence of numerous embedded URLs, many hosted on disposable domains or compromised CMS uploads, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b95668db8c6---vifovirubiwawam.pdf In PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/12399572048.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161277ea641325---wumajig.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079279b073cb---67219342192.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/sezamojakusemupaxabojonuk.pdfIn PDF document text
    • http://usagimatur.com/files/others/59732629966.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/50804861737.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210903114904.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1abf1de472033472fd72f488d6cf160e/ruserematofurudij.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2ad944a7---49778796780.pdfPDF link annotation
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f5c4bc2b9---80302651908.pdfIn PDF document text
    • https://tsegypt.com/file/gepuzojulesosevuwidove.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-7/file/45581760545.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/moxotupadepatovaram.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/93053223955.pdfIn PDF document text
    • https://airbays.com/userfiles/file/51195231375.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/59552405578.pdfIn PDF document text
    • https://maria-galland.ru/files/file/fujafuvunaladojejek.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/bikutekiwo.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/59097912767.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b414b098798---74299947325.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/salowedosovakuvufabupi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/pujaliruwib.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/wepiwujif.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e40be2edec84343ad454a86e0a04d8bb/5387662289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=solaredge+inverters+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_off0000fe5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 10812 bytes
SHA-256: 74fd95c34e5613ad836ed4344486087a616e0905966d6df37243de20fd400aa1
font_01_sfnt_off00011722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11722 19816 bytes
SHA-256: a29dc89ddb8d76ae71165e8850711158937ab4297a93fdd2ddba84e048a5eaeb
font_02_sfnt_off00014b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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