Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ed3724ca1f3158…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 19:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e318e034d5f816d11bea7abfc194cfad SHA-1: b0a777babc85d5f9d242be27e10a29a2f45837dc SHA-256: 58ed3724ca1f31584e3e9433ab39408367137aa65f62414418c99db30c1e2011
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs. Several of these URLs point to compromised WordPress upload directories or domains flagged as disposable, suggesting a phishing or malware distribution scheme. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://celcg.pl/uploaded/file/soxaboridabidukuv.pdf In PDF document text
    • https://cowik.pl/upload/84017314731.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a859ffa7b40---73808302442.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/21283065008.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609767082c1f9---56045576971.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/gadeta.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/pirekajamewutalimajubaso.pdfIn PDF document text
    • http://tano-cable.com/d/files/79956236909.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee4e5cf5c2---74835504069.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6cab31390---24034524519.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/pepezelo.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/fisorovodegazekuzegiv.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/92687622796.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608406351740e---247993420.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/99219697848.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/ravudotonexunapo.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/xirodopexaganid.pdfIn PDF document text
    • http://pinxedien.net/upload/files/fabilijuguve.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce48b261566.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/60989807147.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://er-trans.com/img/produkty/files/josijobojonojidepos.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae83eb7219c---xaziralikuvinorafi.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210622_153108.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/mukagedolenuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=past+simple+wh+questions+exercises+pdf+with+answersPDF 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_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 17628 bytes
SHA-256: fc870825507a827c71a69399b37a7f08f9b17b688b3e1f7f9d88b4ba1996e669
font_01_sfnt_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 11320 bytes
SHA-256: 202c35f5c0076908b2e077c3716bf5cfcc52157bf673b038d209f3ad5fc539d9
font_02_sfnt_off00011e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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