Malicious PDF — malware analysis report

Static analysis result for SHA-256 d212d242f61c74e8…

MALICIOUS

PDF

98.4 KB Created: 2021-06-27 23:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f8240f9783ff0d2a07223a15f3a82af SHA-1: ceca44dc9bbc5ef668eb302d11c71774feb6a3ce SHA-256: d212d242f61c74e81e26035e2696d6da1049ba945bc5a03caeb99221fc1b1f2a
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL findings point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://consulcongress.it/uploads/assets/file/zabose.pdf
    • http://parzenica-bialka.pl/userfiles/files/dobax.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/3ef5934cf7f16e628ab94d8dbc2bc167/tubevogelilexomifomek.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f54907deec---6769296939.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/77432875990.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7b42b89eb8e1d91c830c72f8e599c51b/fabazumopijipux.pdf
    • http://www.sport-konyv.hu/userfiles/file/nafetasedilegip.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608013f694d2e---bitigeduwateda.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160addc1b683a9---65323914622.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c714b50db8---fopumubosuwe.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a627992cf---17556713891.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/jiip6u3cnh0oc9lqhbgliq42sg/tuvujanugasatasoropowowug.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94fe5acb3f---vexaraxesaxopatufujama.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/9e9ff18f13d216619e65e385b5055f0a/1127051812.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/79c4e0551fa739538fbdb6c43a628259/nesitekabe.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/rejanagavagulegiwab.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e955e151d3fac5f72070a571977e7f15/wusupibewa.pdf
    • https://floridainvestment.cz/files/file/tomirobebotibigawifewavij.pdf
    • http://saltokisport.com/uploads/files/rekamumegogusosetufas.pdf
    • http://www.valathors.com/ckfinder/userfiles/files/4821559246.pdf
    • http://aliceinformaticasrl.com/user/pages/koxetalepevefa.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/tovuzudekemagerifavole.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/918232c335ccb3c69e21ed4f14ac44b5/30416387373.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=7th+standard+english+guide+term+2
    • 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_off00011976.bin
7967aef757672e5805884772d667a1359fb5e52aefe77f2db0e2b947ef50ea3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11976 18772 bytes
font_01_sfnt_off00014a9d.bin
176ecb6f8d052155ed18bc959a1eaabb3594f983a7007933269de874b91a3359
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9D 10748 bytes
font_02_sfnt_off000162f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x162F0 16792 bytes