Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdfde957d9f9a12…

MALICIOUS

PDF

78.9 KB Created: 2021-09-01 21:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0480b391a53e5361a78b89121203028 SHA-1: 4311a1bfe13025e82d94b9ce3be455c0af6df4e1 SHA-256: dcdfde957d9f9a12b18d6789759ac5390cf9a78a33bd9e5ae80ef2b06d161c46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on compromised websites, indicating a link farm or distribution mechanism. The presence of multiple PDF link farm heuristics suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, and the document body was unreadable, limiting the analysis of direct user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://gretajensen.com/ckfinder/userfiles/files/49386908264.pdf In PDF document text
    • http://travellightnepal.com/userfiles/file/zozopotuzagemafudofigun.pdfIn PDF document text
    • http://tipiland.net/upload/file/jukigaxuzanopuwe.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/0e10620a519bc94ed85c47253ca3c618/25918498170.pdfIn PDF document text
    • http://sgpeo.pl/users//file/puxoxujamirex.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/15506797389.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815912d1f9d---jujeroroseda.pdfIn PDF document text
    • http://juha.be/_files/file/luwotubagowawob.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608524c6c7681---jalipekemolixoxoja.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/binegumamokinegid.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/62490036649.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/labeworotetosijefarirav.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/67d4d4334bffeaa3af4cbe508393915e/zasawumipimarejaruremuxak.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/valabogiwadofimeroru.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/9vaqunf58rkbhrnnbc685sd1op/xafebew.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161042f1380b4c---xejidibufevif.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/97994dfc857dc6a5d18a2b2160f33477/tekomulinawu.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/dulupasujokupok.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/podubagedino.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/25354365656.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/zonukajagebisamujebirak.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/30515212922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=engineering+mechanics+dynamics+hibbeler+13th+edition+solutions+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE263 11380 bytes
SHA-256: 69914ad754ecfe7ba826f5b249ac0ac0ae58efe64eeaff1d85a75f889d9e14cd
font_02_sfnt_off0000fcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDF 18344 bytes
SHA-256: ef88e394616cca3442416afd6d03c6f7a57245d5df7e4038a54ed660963a57d0

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