Malicious PDF — malware analysis report

Static analysis result for SHA-256 7115fc1116fba431…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 06:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: febdea1f44ee09be2122227263c26052 SHA-1: 523429dfaa8ca47810e5f924a5c7e08b0401d020 SHA-256: 7115fc1116fba431c382c1b329f10c00bbb790762134130f172a917faa61ee30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://netiko.fr/img/Data/file/durirusapopibimos.pdf
    • http://clinicaveterinariailmarzocco.it/userfiles/files/22009526992.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49250664956.pdf
    • http://honderhotel.com/UploadFiles/FCKeditor/20210912134835.pdf
    • http://vkts.se/userfiles/file/galonuwawivisebosirod.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321c55680ce---65206512570.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/aa03f5f3cd1c9d744dc934d262779df4/55082869101.pdf
    • https://villadelauca.com/userfiles/file/9183525971.pdf
    • http://vibrobeton.by/pics/files/97273205217.pdf
    • http://www.salac.cz/ckfinder/userfiles/files/44497424842.pdf
    • http://ayurveda-shiatsu-nice.com/upload/files/jibopulogezuxoteperuselo.pdf
    • http://kubak-ubezpieczenia.pl/userfiles/file/ziwotafomibofan.pdf
    • http://vimar.ua/userfiles/files/13528362270.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f74309d4b7---47639718956.pdf
    • http://dungcucaytrong.com/images/files/lusesufo.pdf
    • http://jpiano.net/userData/ebizro_board/file/wobene.pdf
    • https://vendax.ro/files/file/75687344761.pdf
    • http://eakqshop.com/ckfinder/images_store/files/rikizeluzawut.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a616f387b6---95229524069.pdf
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/94544547854.pdf
    • http://hyeminshop.com/DATA/files/54928027016.pdf
    • https://rimi.sk/userfiles/file/40985440205.pdf
    • http://skipjackpoke.com/ckfinder/userfiles/files/64021147634.pdf
    • http://otworz-biuro-podrozy.pl/userfiles/file/nitomure.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=minecraft+pe+apk+latest
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e291.bin
2aebdd2b2accc848d53608f973ea0d53b4a855f45705e4304340242a3c043954
pdf-font-stream PDF embedded font (sfnt) at offset 0xE291 10436 bytes
font_01_sfnt_off0000fa5b.bin
bfb5b2f86c87424453e0ff177ae1ab2a11c75ccc96cd435fdc6769b3000dcea8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 16852 bytes
font_02_sfnt_off000125f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125F8 16792 bytes