Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9715635598debdf…

MALICIOUS

PDF

84.7 KB Created: 2021-07-01 00:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cfd99cdffc6a0eaf3e4263ea1ea2911 SHA-1: 9f6c06dd942ece14af6a362111145af85243caf9 SHA-256: c9715635598debdf64f2bf833fcad42daaaf76c4f1f0905381eebc1c1434071c
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous PDF files hosted on compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple links to compromised CMS upload storage and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://aloeverajuice.cz/files/file/gojuwagapinarakirudejazu.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8ltjpu3i7h8gpa4jft8g0qfbt1/41545651303.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078df5363b76---wuganolaxoporotizipo.pdf
    • http://ackerviewguesthouse.com/userfiles/file/92910177287.pdf
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/sukiwirivuveserusureboka.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a486c8d87d56bcf96a0eb5820e2cebee/84476843208.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/bacec32d4c2eae3b22c5c13192079abc/tosizoravotus.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3defbe4eee---81193653222.pdf
    • https://charteriraq.ir/basefile/charteriraqir/files/54999637139.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/ratedaxazu.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160afaa78dfcb9---vetosekekivofuzoxarebexat.pdf
    • http://www.allatpatikapecs.hu/images/file/96130570680.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a448389087b---67630136711.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/vitalamosudeninunev.pdf
    • http://wedding-ideas.ru/ckfinder/userfiles/files/sejefuxibiwufelagutelegi.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/8e53e8fe5263c93cbed88452b49b3666/77188714627.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/7137c9121ae0959c2c86c4219ea82da8/88830357298.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/4672f6711c4feea993478e82405c7646/60668492954.pdf
    • http://ahlhy.com/uploads/file/100328559801.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160be1c57ec972---89900822635.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/0583a4fd039af25b4cccc6261374a056/20472409837.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/3eb4656944806ddad3cecc2ad5017584/zimoputovivizimamer.pdf
    • http://curry-box-deluxe.de/userfiles/file/98872025625.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/2f0po1qfv7uppe0qemrjblr002/namosakiminafopazozuliko.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=permutation+problems+with+solutions+and+answers+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_off0000e394.bin
28c2e40328eecf8768aae6bc1a27c3c4f6f81b00c784611eb683726f995149aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xE394 17528 bytes
font_01_sfnt_off000111ae.bin
d94270813322705d8466803ea228e4a152b6fba3f4c9437849f2c7f598799294
pdf-font-stream PDF embedded font (sfnt) at offset 0x111AE 11092 bytes
font_02_sfnt_off00012b22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B22 16792 bytes