Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffdecef6c48aa177…

MALICIOUS

PDF

83.6 KB Created: 2021-06-26 04:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4806c6367e88b575bde713854e2cd7d1 SHA-1: 505db4c44d6aec9b9660c0eb38f4c5abad341a3c SHA-256: ffdecef6c48aa1771424791c2eb17d2f909066812348c287f9c8f660e8a33861
156 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 WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=sexsmith+love+china+full+movie+sub+indo+mp4+download+free+mp4+download
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5e8f60731---nopupujiv.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1efccc2aa8---bifixifewoxotifepedasan.pdf
    • http://primaneighbors.com/userimages/12910724978.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeb0a344c3---jorifepalipilenuwawi.pdf
    • http://toyteepee.com/uploadfiles/file/210613193650305632x643ek.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aba08c9eecd---fovipug.pdf
    • http://vswet.ru/f/92380526886.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608086c363e6e---luminifekojopuxidaxobewo.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4e4377dbb---sovagaladiganevaloluxo.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac94e9b266---85128222548.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b43990d78e8---kujozutexeposugirujo.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6810acfaf1---nuxategigubopizaxesu.pdf
    • http://omonetach.pl/foto/ilustracje/file/58595909448.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607584d780d1f---68213880357.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5f354199a---sigumuwalevapono.pdf
    • http://meteosputnik.ru/userfiles/file/serokebanuwagabimusimuv.pdf
    • http://txextremecarts.com/userfiles/file/tizejiwuwikif.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/funoretipapolawulazavipe.pdf
    • http://aliceinformaticasrl.com/user/pages/lexate.pdf
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/monuxezimixotapat.pdf
    • http://networkinglikepro.com/ckfinder/userfiles/files/jijotefogi.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2198a5b98f---lunudewodovupapukotus.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c157f68137d---11700530274.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_off0000e3a3.bin
9d4ce8c6c9d2797f7ed71e24148cc986e9b4d00968c9e04bd15834fe2c5be15f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A3 16184 bytes
font_01_sfnt_off00010d7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7C 16792 bytes
font_02_sfnt_off00012593.bin
950ca29951b2ec196caa4d6e04323fe734b2039fcc738744e82d879b251c7e59
pdf-font-stream PDF embedded font (sfnt) at offset 0x12593 11532 bytes