Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93bfdb4187ea56c…

MALICIOUS

PDF

86.4 KB Created: 2021-06-26 12:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 774853758a07535e296b8675563377e2 SHA-1: 0c7d86dde7a3aae0d4584f638ab81c613ef015e7 SHA-256: a93bfdb4187ea56c99a8727835ae7cc3427535254e0cf8ee08785232f018547b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of a download button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dfwsedan.com/nbloom/fckuploads/file/52662338829.pdf
    • https://amthanhanhsangchinhhang.vn/upload/files/lerala.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3121f692349b1b337ae313431b78abbe/numunepage.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a9910b4fe8a---65006961916.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16090d18f10bc5---62190999860.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd512eb0692---90763245855.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/aee520dacbd2c156d5ab3df6f1300fb6/netow.pdf
    • http://gat-asset.com/CKEdit/upload/files/nafuja.pdf
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737be372a49---dezoxigila.pdf
    • http://proxima-design.cz/files/file/7695563780.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075937d80fbc---82491295029.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/0f0df4a0849aa777fe0d4d96397459fa/roxozozupuji.pdf
    • http://alibabashipping.com/userfiles/file/rigewelixigasutupisolo.pdf
    • http://bakoca.hu/files/file/29176034353.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbcae2ded5---zebabazusizuvexonu.pdf
    • https://olterus.com/contents//files/banojofawajuno.pdf
    • http://sanga.asia/userData/board/file/wuginunovulunag.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0436671cc7---21101253493.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b88ca862f---46608014733.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6610679d35---mujodomuruxira.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3db8be5612---bexusuwonu.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/33cad4c6ca500d031c546d71adf97c66/xozisibepami.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f07409e531d1f533c24ee33df325a205/8443397365.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=real+cricket+21+mod+apk+download
    • 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_off0000ee11.bin
ef789bea5c220d62ee1b45f5b8080276033f493f257899bfe66ef1443bbc5495
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE11 17088 bytes
font_01_sfnt_off00011ade.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADE 16792 bytes
font_02_sfnt_off000132f5.bin
d53aa246ae552e65f57c9627fed087665618fdd7999e6c437e9562fcc2ab192a
pdf-font-stream PDF embedded font (sfnt) at offset 0x132F5 10900 bytes