Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44bab181d738dce…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 03:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a31969c7bbccc3ee4353b2e1cf21401f SHA-1: d0ffdd4bbf9c9585ca66d641379cba1aa53a7d8d SHA-256: e44bab181d738dced0aefa6fde8ea56c0a8c1f98dfc392da2157d637ccc0e744
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pixomot.ru/uplcv?utm_term=eminem+it%27s+not+so+bad
    • http://kommunikator.nu/demo/userfiles/file///83840176046.pdf
    • http://mtt-association.fr/upload/file/76525477544.pdf
    • https://deltagroup.bg/uploads/file/gozolefubalinisu.pdf
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/14782228431.pdf
    • http://cngwalk.com/fckeditor/userfiles/image/jijulozivusuzuwog.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e1c357e4c---votuxexumumafuvutape.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369ff523ec8---dekatulekute.pdf
    • http://xetaihyundai.net/upload/files/80968994036.pdf
    • http://stnicholasway.com/userfiles/file/murekamuvoj.pdf
    • http://sm300159.agchost.com/userfiles/files/fogatu.pdf
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/gasinugiwiluluxesozawotog.pdf
    • https://samsunyapi.com/userfiles/files/tetinepimanupasukeza.pdf
    • https://atamergranit.com/userfiles/file/farututenitabekajunivoxa.pdf
    • https://condominiovillage.com/userfiles/file/wesesojejifimojug.pdf
    • http://naphotelbangkok.com/userfiles/files/48056347826.pdf
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sumikene.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ae9aa5e1ff365068d9326ec28df93ec/datojiguzoxuti.pdf
    • https://singlespeed-switzerland.ch/userfiles/files/tixotagetudabi.pdf
    • http://galettedesrois.eu/userfiles/file/1556354807.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353625872ac---90950815504.pdf
    • http://slmj8.com/data/userfiles/files/18898373790.pdf
    • http://sutipatika.hu/userfiles/files/motavesijigimin.pdf
    • http://mt-filtration.com/uploaded/file/361775006131622ce0e58.pdf
    • http://porpora.biz/imagenes/imagenes_contenidos///63820898887.pdf
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/pujolupomagiwarifesaveze.pdf
    • http://bettaletroom.com/file_media/file_image/file/gesorojuvenezes.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_off0000e166.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE166 16792 bytes
font_01_sfnt_off0000f97d.bin
9a3387d497c1e01ff65929bfdf0f7732fdf3f3a8779efde36bd5c7e0657909b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF97D 10420 bytes
font_02_sfnt_off0001111e.bin
eb8e3af6fe819bbffa72f43e8fc467dfcec2febcbd0a823661df61578add756a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1111E 17640 bytes