Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ce038306afce6e…

MALICIOUS

PDF

71.5 KB Created: 2021-09-19 17:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28aa36e144146586374a28bc3154f05d SHA-1: 40902742df11feb196daee34ce06d06fea43270b SHA-256: 18ce038306afce6ebe50b053acc0c265a71b8db833a4e94fe978402943954af1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics indicate the PDF is a link farm, pointing to compromised websites and disposable hosting, likely to redirect users to malicious content. The embedded URLs suggest an attempt to direct users to external resources, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=fire+red+loveroms PDF link annotation
    • https://www.delaneyllc.com/ckfinder/userfiles/files/77497547357.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///zumejezumufanise.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/55814542384.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/woxaralomoranisukur.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/46500957211.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/viluwer.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///33737903087.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/a714d0610f36597f09f97fd6a55b2de3/kezumiki.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/7b069089cf474e33455f6ca4072a1e3b/9750192955.pdfIn PDF document text
    • http://unsersohn.ch/images/file/48909134534.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/gaduvuxetepibobalovaxilov.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/95946634186.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/fuvoxumoxedotipifif.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/kezisujeberizukuzumuxop.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/bimir.pdfIn PDF document text
    • http://jar-ted.pl/file/ximivafeg.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/62729883844.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/kamigubunilibezamojuzegi.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/mirifo.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210918092918_scy9tj.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/82100368299.pdfIn PDF document text
    • https://fototipia.hu/files/files/29249849227.pdfIn PDF document text
    • http://tchid.net/userfiles/file/wimojigomuzefeviwigi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ef2059cb215178c8d0075dc5f76a1d88/turitawogamowe.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/40891745260.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_off0000b775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB775 16432 bytes
SHA-256: f3d95f357f3d844a267d07912898fa62d65538f1053ebd41802bf6692d9f2b2c
font_01_sfnt_off0000e18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18D 10088 bytes
SHA-256: 22ca56a050978dab95f2579cca4ad557f2273b7216cfcdfa33f1c4f425a6700d
font_02_sfnt_off0000f803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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