Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6941da18c434717…

MALICIOUS

PDF

87.6 KB Created: 2021-07-04 12:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d50b4e85f108f158256edd39439f2072 SHA-1: 083ccbc8212c4eae343aeb2b2535f3673a812b38 SHA-256: d6941da18c4347177ca55ba6330ed89f81daec9a6d3e8ffa6ee5f28116521a64
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress installations, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3817363f243305abb5f85d5af13b0474/87947123376.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/9eaf96957726d8703218d22fa947f557/92361718706.pdf
    • http://joy05.com/_UploadFile/Images/file/vutotigujaxetolomok.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160715065c224b---zejutiz.pdf
    • http://hz-karavany.cz/ckfinder/userfiles/files/lilusuvuve.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9aafc1ab8c---dasevivewimutunek.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16097f0970de04---61531460066.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160762e1fd3d95---95752102872.pdf
    • https://bataretak.com/img/files/file/jubizu.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608862931ce84---79166758883.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160bb52d464fd0---pavivelox.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db6ede9df9e---bezivewoxuvowutizodera.pdf
    • https://pjkconstruction.ca/images/file/negixeganu.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/bb5b58883fb55e96c5385f89bdcc7ceb/83986471001.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/4c141206e00f675d573cc5bc25634876/75875272606.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852e343ee3c---pupukokuvusozabezexajow.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aada2569db6---joruzaxawexefesupuvaj.pdf
    • https://forumhrdbekasi.com/webroot/userfiles/files/bozaxivuwun.pdf
    • https://pnlcoach.com/misc2/file/
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/11771be5a25515a110a7ea9f1267dbc6/wudujimolarekaperadova.pdf
    • http://cck-brno.cz/ckfinder/userfiles/files/46115605969.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+boy+who+cried+wolf+questions+and+answers
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 16792 bytes
font_01_sfnt_off0000f3a6.bin
86b3329a8ea14964023b58d7ff4d707b11358d19e74d316374a24739281a93f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 17324 bytes
font_02_sfnt_off0001213e.bin
d8092968938aaeb7afee4a221b301aad4f38f8662c882099a7400ff4b4e7e29e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1213E 11120 bytes
font_03_sfnt_off00013b03.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B03 16164 bytes