Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3cb7f6ab71b9050…

MALICIOUS

PDF

77.4 KB Created: 2021-06-27 10:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: baa38828e2e723c1196f16b4b210afe9 SHA-1: baa6b4c0cf2f077127f77dd82b916db852061be4 SHA-256: a3cb7f6ab71b90503cec371add2434f3a5f45e39ba942f12dc065a68f7bc9f3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://liantoong.com/archive/upload/files/83350907942.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/h5jq1nvrfrj18tim301dqlkp44/95393578361.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5ccb65789---20608171545.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/df8cc0e3ff7363fce6812b2d6515277d/32304118424.pdf
    • http://fernandopelosini.it/userfiles/files/dufidilapetazi.pdf
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/rupitowazutuxaxekizefi.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/fbcf0ec6b1bd40ee2185503b69f9428d/lasamajaxamixupenazix.pdf
    • https://alatheir.com/atheirwsfiles/file/kegakaro.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160965962da8bb---73477203300.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/ph4s34kh5kmkto3aobe8fugqf7/97865624159.pdf
    • http://bassbasement.org/userfiles/file/72820781992.pdf
    • http://solartgaleria.hu/images/file/95711954443.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/75dbe6d76543a5225006498d1188552c/53409990645.pdf
    • http://reutlinger.pl/userfiles/file/20258228365.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c11c6ff23---53346929504.pdf
    • http://booklandbooks.com/userfiles/file/jubanupu.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ad2ab00c4---jugapixudir.pdf
    • https://techson-cctv.com/upload/file/55829705000.pdf
    • http://hzbmsj.net/images/upload/File/pavezalifigutupifufedenog.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/npmvnsbm2s60u642lpn1b5glm4/divumafuwuwelevotosivo.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb059de5ec---8914025398.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/7n54m0ovmgol9ersire0le5gk5/55532113969.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/9320jp5fnfd2qlo984rptd42a8/49637949144.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d01588455f2---23698059786.pdf
    • http://cfacgroup.com/uploads/FCK_files/file/fugolivisojivarivepo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=spotted+tree+monitor
    • http://s292376414.onlinehome.fr/datas/imgmail/file/tijaki.pdf
    • 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_off0000cd88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD88 16792 bytes
font_01_sfnt_off0000e59a.bin
7ce923fed118bc67a2598d078983b7dd2357cac3d86558384db649abbe88e797
pdf-font-stream PDF embedded font (sfnt) at offset 0xE59A 16932 bytes
font_02_sfnt_off00011195.bin
7e6665c6215d923216e3ad084bf413cc9a4cbed686da6ab8512c6af092ba4ff4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11195 10252 bytes