Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba10fc14407f218…

MALICIOUS

PDF

81.3 KB Created: 2021-08-29 17:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29ac47334443acfb0ac1a3f72fb584c9 SHA-1: 275aedec57e065e1aba2daccb0b2b5f00b311eac SHA-256: 2ba10fc14407f2184919f45a2001f03807d5bb8bfbceb6ce9eb1e1a6229a0b8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which are associated with compromised WordPress installations or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the PDF structure suggest it is designed to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://bucatariizidite.ro/printuri-fi/files/fobed.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/0c5f1397ad7da002202fe80b4f0cb18c/22366347457.pdf
    • http://abogarestudio.com/userfiles/file/29325467029.pdf
    • http://www.moyekolodin.com/files/66007904484.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ae5fa0a40---52392796786.pdf
    • https://cmetrix.net/ckfinder/userfiles/files/35834373919.pdf
    • http://nickels.design/ckfinder/userfiles/files/83914208540.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11a5735a6d---gurevegokisoramofopolu.pdf
    • http://csc0898.com/userfiles/file/20210829075401_3kpbn7.pdf
    • https://ovalpolycoats.com/media/kaxirow.pdf
    • https://zlatartopalovic.rs//files/95929518766.pdf
    • https://turbooto.vn/upload/files/mavedes.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1031b1c809---daged.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/v3fspr4jf1korjb6vrksa8018l/76034518294.pdf
    • https://tiklatakip.com/calisma2/files/uploads/xupupimataveraruk.pdf
    • http://0-50.ru/userfiles/file/75710728067.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/b9p684raobhd9st7luq1cehek1/suxaxabekimawikororilowir.pdf
    • http://greatwalledmond.com/ckfinder/userfiles/files/giwodejufunipururibuwid.pdf
    • http://4grd.com/cmsimages/file/zazegelapuzirijamexem.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/753b5b74ff5d8ee608d58524ce196987/xerowo.pdf
    • https://glbtrader.com/userfiles/file/90372103415.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ab1874d6053b0af215c1b87ac98628e4/wupivavixovovusako.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160730cd072de4---xezusakisop.pdf
    • https://advantagelic.com/singhania/downloads/file/18293857558.pdf
    • http://aligokdemir.com/resimler/files/rujufuwujikukudugeno.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+convert+word+files+to+pdf+for+free
    • 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_off0000d9c9.bin
38ad6b78ff6931ba419a54185efa5b4ca14d4c5e8e89ec64de695b8e1c96abdc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 10592 bytes
font_01_sfnt_off0000f214.bin
84a321ddcd9661620e1d6818ca4c5ace1bc1c1e921de7641c269e9eafb0ae429
pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 17252 bytes
font_02_sfnt_off00011ec4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC4 16792 bytes