Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4c25d4b0c162b3…

MALICIOUS

PDF

98.5 KB Created: 2021-07-17 00:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 23d6772ff2110e9358ccb2d46b32b445 SHA-1: ea8e3ac5a06817a1b231a0c9ac260e9fc4b2c428 SHA-256: bf4c25d4b0c162b33c69db7bf13fcae7c4612a67c8ef98071e2d6e4922b81d6d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which are hosting other PDF files. This suggests a link farm designed to direct users to malicious content, likely for phishing or further malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9785

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 http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d592b00b427---samisavapasemofokivux.pdf In PDF document text
    • http://sevimticaret.net/userfiles/file/gaxagen.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849341924a0---7036405178.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e3df38f0a---34612864597.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/lisamorafulafuvi.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c12c6f4543e---dexirilolarisipakob.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/wafovi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df004de932---66150840097.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608801637a413---lowojavojowipape.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/zutiwiboviguretoju.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd57851dcb---49780319944.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/6p6ihr3hfafl4i4lfqba3u4q7q/finalulupanet.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/nemit.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/murepima.pdfIn PDF document text
    • https://magerp.org/upload/files/zalav.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/6skpatdagmrou3jvfufjdh6ad9/gimidewewutaxosujewul.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087d2e9a4a17---80844768001.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/89151753030.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/53599209832.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210516090604_1387626517.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/38517172010.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/362f19b4dbe61e9fe56bc9a18f649145/vamifirilodoza.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/gakinulagak.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a65d1f92876---bikazeduko.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c965d64e0a7---mikavofiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=rich+ceo+and+his+poor+wife+novel+read+onlinePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF5 1772 bytes
SHA-256: 172309685fe98285604e713d49568994867313c34855d65ac26f2a3d6e9690f4
font_01_sfnt_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 18948 bytes
SHA-256: 2f9aa885a132158e1979e43cd0ca69c7d7d774b53eba2f545837b81bcedaf168
font_02_sfnt_off000135eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EB 10816 bytes
SHA-256: 5efad38183f46553e1a3f1abd6bc55f6f96237344b3538970754c1deb9df362f
font_03_sfnt_off00014ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED2 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_04_sfnt_off00016443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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