Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3471d883fe9c13…

MALICIOUS

PDF

172.6 KB Created: 2021-06-26 21:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f01adb09d3e14f40b06913187d95d6c7 SHA-1: 6627288e2285086693e900e15c9e1bad91643dfc SHA-256: ef3471d883fe9c134264de92bbfec7561e4e590d520519095855c85759dbe917
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, likely to obscure the true destination or host malicious payloads. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to trick users into downloading further malicious content, potentially through a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9474

Heuristics 7

  • 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.
  • 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://alarouba.com/ckfinder/userfiles/files/32808638317.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ece2d158a9---jovutefali.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/d0111fc465e097c58d8435687532d92f/67272888760.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4adaf73ecc---40721934693.pdf
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/33138776109.pdf
    • https://people11people.gr/uploads/File/fifog.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/8e4852b32baf6aa77d810f71f6eb3eb1/ludafis.pdf
    • https://mariellatriolo.it/public/file/94483850713.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870bd82e043---29137565414.pdf
    • https://akproauto.com/nbloom/fckuploads/file/4929304171.pdf
    • http://broadmoor79.com/clients/864886/File/jiwoxir.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bc8fe8609---rifibotijolu.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a73a53c4b08---zupev.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa7cf77e4a---48878407317.pdf
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792726369e2---84461156017.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a2222ce010e---47317147593.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4da3f037be7c2fc5e61778d902cd6d9c/baxazoloselejisezawiko.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a07c389c8---10550699769.pdf
    • http://ttmplus.com/userfiles/files/27698240458.pdf
    • http://dailycan.com/userfiles/files/80220434550.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ab14fea3939---92489017297.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/th0sp0dte241uqssaq4mudo61d/69117341464.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/rvfj17009k4m3dpggaqd1n0kdg/16897458393.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=class+9+nepali+book+question+answer+2076
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021b7b.bin
ffec5ed736198f31a516d4d119023bec14c832e6ff6c37309a387533fe84c314		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21B7B 2444 bytes
font_01_sfnt_off00022622.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22622 16792 bytes
font_02_sfnt_off00023e34.bin
3f3430515437a1fa4823d14c8e7e18140db9c0ba5e93f7c611629f9e94a11a33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x23E34 20160 bytes
font_03_sfnt_off000272fd.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x272FD 16092 bytes
font_04_sfnt_off00028843.bin
b615f86b1255edb1d42ae02ae7f2add510cf458d54b461833e597d2be2153566		 pdf-font-stream PDF embedded font (sfnt) at offset 0x28843 11468 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.