Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1ee667e1171ae3…

MALICIOUS

PDF

85.8 KB Created: 2021-09-20 22:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8dd1d54c0f278b676aa39f8ddd0b6d8c SHA-1: 0d734f2d3c168a5e2f70a46f6f4659597c75acfa SHA-256: 8f1ee667e1171ae3ec8f3e29be953e2b2f983450b2514fa8a0ee65676310addd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple disposable hosting sites, indicating an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a phishing or scam campaign. The embedded JavaScript likely facilitates the redirection or delivery of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://035620126.tw/upload/greenkitchen/files/giserokasifaji.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/c28c8bee030ea0c4ba3238cfe962d343/56719698457.pdf
    • http://wakesup.org/userfiles/file/14374163248.pdf
    • http://urs-certification.com/gais/image/file/gipipifogumamisikefuv.pdf
    • http://wskinbody.com/data/boardData/files/27335974424.pdf
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/narup.pdf
    • http://geometrabottero.it/userfiles/files/9979185979.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/tomebelabetowe.pdf
    • http://mrs724.ir/basefile/drtiketcom/files/letamakam.pdf
    • https://zhongzing.com/uploads/files/202109151202133688.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614169ada6039---78767846955.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/d647b312e83f20373965dafa98ce8757/pakomiwu.pdf
    • https://larustt.com/upload/ckfinder/files/71829814936.pdf
    • https://alicantea.centralcms.cloud/galeria/files/70387987214.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16134385ebd813---rejowu.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ee5a4c4e8---64160977633.pdf
    • http://globalbizkorea.com/userData/board/file/wavose.pdf
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/punazutuxad.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613c70ba1995a---44431458341.pdf
    • http://logenamerica.com/userfiles/file/99848033618.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c977c4cc24---lapujuziwebexi.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c594f655ec---jelakexugovon.pdf
    • https://aspit.ro/imagini_ws/78000001369.pdf
    • http://kwiatmetal.pl/userfiles/file/genenorobifakakekeridaw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ludo+king+apk+android
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d87e.bin
7b3328820f26a83e2e3850d8918c7a52737a39be2027d575a4d931da3edb9551		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD87E 22168 bytes
font_01_sfnt_off0001117e.bin
ec5eae2b2cb90c282b180438e9b9f09098f65ce097c241b31a761e651531ca61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1117E 10272 bytes
font_02_sfnt_off0001286c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1286C 16792 bytes
font_03_sfnt_off00014079.bin
b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14079 1868 bytes

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