Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99abcef3819ece4…

MALICIOUS

PDF

77.3 KB Created: 2021-08-02 15:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 26e9978e7a3b0d82ffabea9b62eb56b7 SHA-1: 0e6b754e75f4e63aa183da6436878ae4bc221cd8 SHA-256: f99abcef3819ece41c40427f4d3c00ba93de423a5c801e11a68e2501610b6638
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm heuristics indicates an attempt to lead the user to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chcial.ru/uplcv?utm_term=past+simple+regular+verbs+worksheets+for+beginners+pdf PDF link annotation
    • http://divapharma.com/uploaded/file/mosijigipikerikibudowadu.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/luronu.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/9e103799a50af040260736c3e05363b4/98065478289.pdfIn PDF document text
    • http://tele-video.ru/upload/files/xuwamizevugedo.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/29649316610.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/9197109753.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fk1dnrf9nt2qudjo2j8ebp2bt5/93612575763.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/a505f62a3a5dab994a5d493836eee705/19027237413.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/280211523901.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607d285de48aa---rukelipubipi.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/vn89gb79jdmk3vtn31g8l2eafo/kurolumip.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/guliwedexa.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/cb20ba31b74ba25e7d2f79445416fcc7/rebekozodexaboziwudawusu.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/tnk0kn4qnoabgirrikaftrlkgf/boratikinajefanuw.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/legodovixamufe.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca81a7d251---kobalanovidikib.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/9fdec89b8b7a4a0bf738eb6fc7142147/gumate.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/24034035444.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/82588694731.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/34935969957.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4jj9eohm4kdetdhhnd32jkc9r3/7620016025.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/jc5pcqnbne4vu7v186ruo0jd13/tatejanafadim.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/tudusitanifenerevetafup.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/92skbo19uea5md3v3075uummq3/32131153069.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/kd9coieh3s3jk92tocdpb1mca3/67537476811.pdfIn PDF document text
    • 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_off0000cb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2F 11428 bytes
SHA-256: 13feaf1f6fddf4a17a33d5030247ed21681c753852747b6f5a53cd02e42ded80
font_01_sfnt_off0000e599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE599 15608 bytes
SHA-256: 61b0988a1f0b780642d4960ae002444c93ea75edbc644ae016068d81ea4b4dbf
font_02_sfnt_off00010d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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