Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94dc55731e03099…

MALICIOUS

PDF

89.0 KB Created: 2021-08-30 19:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03fc5311afc08c95b322c6eb61c0ff7e SHA-1: cc10bb1d8237532e44417f1931de06bfe51911a0 SHA-256: f94dc55731e0309935bc378299cc03aa6f739baade0904d2f0afac530955170b
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a link farm hosted on compromised or disposable domains suggests a phishing or malware distribution campaign. The embedded URLs point to various PDF files, likely serving as lures or further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://asi-filter.pl/files/file/nabebujaritifatubej.pdf
    • http://hmed.vn/upload/files/timesasuxebedigenade.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/tk2cfe43vg84nffgd1d6m39c80/2791484400.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab397fbb1e4---35689835827.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160edf0189de69---medulo.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089da02e5f8e---tuxulotajazur.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/bfn12tku845s106upg7u1tef8e/38252458879.pdf
    • http://yourbuilding.ru/userfiles/files/58258881108.pdf
    • http://cascinamana.it/userfiles/file/72895641698.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/7894c741863c7f7742a0fab756f6dff7/tuluvewizenigegok.pdf
    • http://fedime.org/imagenes/fekavevoto.pdf
    • http://aktifimmo.lu/userfiles/files/xuvebozedivedare.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/776084da8c2aced27519b4806fa0c5ae/65931338705.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c5359dc30---61354324991.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/53e293dce1afb2ddb85f7a3f7f37c996/35781912121.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/j5mf98tekhcm72g5dgdu8jlpgk/60074641004.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d434ba7d2092742cd01e52fbb9664ad9/koneromofutojanufipuziful.pdf
    • http://vandientuchinhhang.com/upload/files/wipevalonijevuli.pdf
    • https://2acontractor.it/images/file/44029351023.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a62bf03facc---govazixasatem.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/89930281119.pdf
    • https://pakistanchristiancongress.org/userfiles/file/16973285548.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4eaa26b571c3342ecf0a46d39bd4ba73/53852075214.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=irvine+library+assembly
    • 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_off0000fbf2.bin
e1dbe1c9552754f97729c3cc30a60cf36e74f9fd12caec9944b8446208cb4409
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF2 10324 bytes
font_01_sfnt_off00011328.bin
6c959da7bbaae19e411f26c1588d9ad5023f995623df98b4802efd64a1518c91
pdf-font-stream PDF embedded font (sfnt) at offset 0x11328 16952 bytes
font_02_sfnt_off00013f38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F38 16792 bytes