Malicious PDF — malware analysis report

Static analysis result for SHA-256 227d3a3f50dd92a7…

MALICIOUS

PDF

78.2 KB Created: 2021-09-02 09:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: af3ab406e7a1c6caead634e5dba6f1e5 SHA-1: 866c6a39cf6d0b4fc544c5812a965ed7a209c05a SHA-256: 227d3a3f50dd92a7ed626c4bdeac69f4fcbfbe260db6daa481f48ddd4e7a17e5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, including those on compromised CMS uploads, suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://riverhouse.at/pcms/content/file/liporegatuxa.pdf In PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2fed22878105cd6bc546ba95c9f228f5/60433648226.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210708101508.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/8983946871.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/fagizotukitefelipofazot.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/napobonalunawe.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/4e068ed01c814256305344031b1e588e/83641414333.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160fa0eccdb596---bezufekadeginak.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118b8d115999---39045844206.pdfIn PDF document text
    • http://servmed.net/userfiles/file/mexeritifexixovujo.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210725003232948.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/imhbo7ac1gm1qi2pompkucbs54/5428468701.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/wuxaxotelawi.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4c4115661---domapisis.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/58047631025.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/m7r8gop57hnsqjvsg3jtsdif1i/napotidamidavesudepe.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/wusoxuret.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/9f7mlmpa71fqkhak6qq40nfmo6/50128494305.pdfIn PDF document text
    • http://jp-cable.com/d/files/polafumajuxasu.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021061009013389.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/98033342781.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/88164a647b255511eb834e90194ccff2/57250554129.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/nejotiwusijoxasasatubamu.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/78863619555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=free+camping+near+seattlePDF 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_off0000cbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFD 10572 bytes
SHA-256: e876569c212df0cc54ae746eb14786ba52b5803428328e89e824f5ff2422b659
font_01_sfnt_off0000e40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40F 17928 bytes
SHA-256: 362809d20f58a22d0e54b20eea6da6491421a545a8ca19c9712e57c27f7aeaaf
font_02_sfnt_off000111e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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