Malicious PDF — malware analysis report

Static analysis result for SHA-256 a531b6deb0e03a4a…

MALICIOUS

PDF

84.8 KB Created: 2021-07-24 04:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b06796c6f9c7404d8a124c6eff67794c SHA-1: f204392e07f4749d24de0dc9823f1acedb2b7cbc SHA-256: a531b6deb0e03a4aa5d340eb975eac764350ea29ef1e771ce7a767ab53375e49
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating an attempt to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. The document body is heavily obfuscated and unreadable, but the presence of link farms on compromised CMS uploads is a clear indicator of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae86d7d13a---sadexisaditibixigiv.pdf In PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/eiubj3amt3qkm4qqt361nha27n/lejezakasem.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/670bddaa58fc4d46c59d45b7af4cd64f/rotugimebuxuguxumiwidutog.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/54938972643.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7eb859b21f491f742969c2aa8d3a360b/jepijaxalelibimives.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160848f625c3b0---fujosadurasukuvixezen.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/sijuguwenuxegi.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/tawategivizewe.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160813e33a9afd---49474410766.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/7ff1b0b24f655069eef11433e938b9ce/zupefawutaworixupir.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/c41171073ea285295fbb864dfe40f383/69661126206.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/simujogegonipuvagunizule.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607f1aba1fe71---96912725607.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210620_a61b9.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/getonazuwavijo.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ebee3561ce1fbdac7d49cf0181c62435/24096672177.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/fedadudipigomuf.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/jofutefewiledaraz.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/tofpo6jtm7ikarjjhekq5srmjh/zusesozulanovabibomotefab.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/lonizusu.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/ad6eaaeb19fc0c1c715aefb269875c47/34552870080.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d403438fb---70080972240.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/0929fd14acf3417af2c426338ac07708/94249205243.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae9884738f---58349084927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=why+is+macbeth+to+blame+for+duncan%27s+deathPDF 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_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 16544 bytes
SHA-256: 852092b11c46a3ab0dc8d1e17c726d8062da99d0cd0e35cc914c58d66d0cfbd1
font_01_sfnt_off000113e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF7 11120 bytes
SHA-256: 792384d3395ea6ced935b0d1b5cc3b99fec616c4cefbc55f8031fcc8d2ec291b

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