Malicious PDF — malware analysis report

Static analysis result for SHA-256 720e9dcbf1dea244…

MALICIOUS

PDF

79.4 KB Created: 2021-07-09 02:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efd1a29d49539029b7ca7ebc1fbf2930 SHA-1: dd91b532dc0362e407eb0a4daf99b865797a50fd SHA-256: 720e9dcbf1dea2444c392d2c0f5b138dbba5491659df56f6ad3d426fa398ea01
196 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the presence of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cbcbc0ac64e---lujebo.pdf
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/71123474268.pdf
    • http://mai-colle.jp/userfiles/file/21420361837.pdf
    • http://riverla.vn/uploads/userfiles/file/towinejepinalibaju.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a8ef45743---88685225351.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1de2abc72---foresuvusuv.pdf
    • http://c-amc.com/upload/files/71785704953.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/epa7ks91d47j1v1o7qg6gso4fv/73542795176.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7610660595---76918754487.pdf
    • http://alexhoffordphotography.com/temp/files/file/11401974196.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4ef262673---71957039799.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/190530b1b4df59689a69888a33e3e701/95417439241.pdf
    • http://emannsltd.com/userfiles/5308694507.pdf
    • http://kuzfarm.ru/images/file/91406361514.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160b299ddcaa36---zofapokevetogifovibuzuwaf.pdf
    • http://prttour.ca/FileData/ckfinder/files/20210629_6317536419615BEF.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b13a06310d---74114422389.pdf
    • http://sola-brothers.com/userfiles/file/43501807679.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea2a9863e1---bopifipujusovivikat.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/nlniblhut0k0g85r66vmbub5i4/22428112795.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f4c2a017d---49503467306.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/2ce83c00fbb0aef9c6c67b80a0ca073b/37737151516.pdf
    • http://micronforgacsolo.hu/UserFiles/file/99570462269.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160773807ea63b---99526381713.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=writing+warm+up+worksheets
    • 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_off0000d4ed.bin
67484bd05e1770882e91c3904baed182d7144a35bdb6f2ce0e4ee21b20160b68
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4ED 10924 bytes
font_01_sfnt_off0000ee26.bin
d9652335016e9befd780b9dd67d5fd7ea8044267ea08791110339020b93073ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 16532 bytes
font_02_sfnt_off00011866.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11866 16792 bytes